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System powers on for a second, then cuts off...

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June 23, 2007 9:10:42 AM

Hey, I've got a quick question. I've fully assembled my build hopefully correctly inside the case, but when I hit the power switch, things turn on for perhaps a second before cutting off again. About two seconds after that, they turn on again. By "things turn on," I mean the two case fans, front LEDs, and the CPU heatsink fan. I don't know what happens next because I haven't ventured to leave my system on longer than that. It seems like some sort of problem with drawing power, but I've tried it in a couple of different outlets with no change. If you had to take a guess, what would you suspect?

For those wondering what the setup consists of hardware-wise, it's exactly the one found here: http://www.tomshardware.com/2007/05/09/system_builder_m...

P.S. I haven't tried an out of case build yet, but I shall in the morning. I thought I'd still throw something up here before I crash for the night to see what you guys think. Any help would be appreciated.

More about : system powers cuts

June 23, 2007 9:53:42 AM

Your link didn't work for me. Your next step is out of case build. One poster had his HS backing plate on upside down and it was shorting, even out of the case, obviously. You have classic MB shorting, or other shorting, symptoms, except the restarting. Usually the PS will shut off and not restart until it is turned off at the back or unplugged, but with all the PSs out there I'm sure that there are plenty that will reset and try to power up again without a power down.
June 23, 2007 3:08:33 PM

The link is fixed. About to try the out of case build.
Related resources
June 23, 2007 3:50:30 PM

Did the out of case build. When I power it on, the CPU fan starts turning and I immediately get a high pitched sound from the motherboard that lasts for about two seconds, then everything shuts off. When I flip the power supply switch off to cut power, things whir to life for another half second, then stop. I've double and triple checked my connection and don't know what to do. Any advice?

Edit: Poking around MSI's (my motherboard manufacturer's) site, I found these beep codes (http://www.msicomputer.com/support/sup_tshoot.asp#1_4) that seem to suggest something is wrong with my CPU or cooling...
June 23, 2007 4:33:44 PM

High pitched sound? From the speaker? Other components that make high pitched sounds are usually defective capacitors. Try to locate it exactly...
June 23, 2007 4:34:31 PM

If you can try using the CPU in another system or try putting another CPU in this motherboard and see if you got the same thing?

I actually had this problem before, and what was causing it was one of my backplates fell out of my case and I didn't realize it. It was resting halfway out the case and the rest was resting on the video card and causing it to short.

Not saying this is your problem, but if your beep codes indicate a bad CPU, try it in a different motherboard.
June 23, 2007 4:58:10 PM

Zorg: What is a backing plate? I'm not familiar with the term.

Aziraphale: The high pitched sound appears to come from the motherboard, though I don't think I can localize it any more than that. There are no speakers, I'm doing an out of case build to try to get this thing to work.

sweetpants: I don't have easy access to other components, so switching them could be a pain, but I'll see what I can do. You also mentioned backplates/backing plates. What are these and how will I be able to tell if something is wrong with one or more of them?
June 23, 2007 5:03:50 PM

Trial and error mate, if you got spare parts swap em around til you find the one that doesn't work.

It sounds like your motherboard may be shot.
June 23, 2007 5:06:47 PM

A possibly related question: How long will an uncooled CPU take to overheat to the point of damage? The CPU in question is an Intel C2D E6600.
June 23, 2007 5:14:29 PM

Try leaving it on. The squeel is from the video card's "PCI-Express power connector disconnected" warning buzzer. On some systems, it will squeel briefly whenever you power the system up or down. If it squeels continously, it's not getting enough power through the 6-pin connector.
June 23, 2007 5:21:49 PM

Crashman: I will try connecting the 6 pin power connector to the graphics card. Will a graphics card that isn't recieving enough power shut down the system? Because if it doesn't typically do that, then there's still the issue of things starting to run for a couple of seconds then cutting off.
June 23, 2007 5:23:35 PM

What I'm referring to in back plate is different than what the other person mentioned... you know those PCI plates that you have to remove from the back of your case before you can put in your video card and such? Yea one of those was shorting out of my video card because it was resting on the external enclure and the PCB of the video card. Should have nothing to do with your problem..
June 23, 2007 6:49:17 PM

as far as i know, u have a defected or burnt motherboard. because this exactly same thing happened on my friend's pc, and the final result was that it was burnt. hope i helped.
June 23, 2007 7:31:21 PM

Quote:
What I'm referring to in back plate is different than what the other person mentioned... you know those PCI plates that you have to remove from the back of your case before you can put in your video card and such? Yea one of those was shorting out of my video card because it was resting on the external enclure and the PCB of the video card. Should have nothing to do with your problem..
The plates that you are referring to are called blanking plates not backing plates.

@OP What I am referring to is the CPU heat sink back plate that is used with after market heatsinks. It is placed on the back of the motherboard to distributed the weight of the heavy heatsink. This guys was metal and had foam insulators on the side that is supposed to contact the MB but he had it on backwards and it was shorting the MB. If you are using the stock heatsink than there is no backing plate.

It could be a bad power supply. I checked Newegg reviews, I know they can't be trusted, and there were a few that indicated DOA etc. Try getting a tester like this one.
http://www.antec.com/us/productDetails.php?ProdID=77203

Also try removing the Graphics card and seeing if the mobo or PS squeals.
June 23, 2007 8:08:49 PM

Ok,

Take the motherboard out of the case and make sure and check and if not sure check again that the heatsink is correctly installed and the "plugs" which hold the fan in place are in the holes and plastic lugs are not bent in anyway if so remove and insert again.

Second --- usb ports on front if broken will bring down a pc because if 5v goes to ground the board protects it self from booting up therefore stopping damage..

last but not least powersupply but i recon heatsink is not installed correctly

Intel 775 need extra care and attention when installing its not a quick rush job to install as some are eager to get their pride and joy up and running.........


Good Luck
June 23, 2007 8:34:42 PM

No, it's normal for many of todays boards to start just long enough to read configuration data from the CPU and RAM, shut down, and restart.
June 23, 2007 8:57:59 PM

Quote:
Take the motherboard out of the case

Did you read the entire thread before you posted, including this?
Quote:
Did the out of case build.



Quote:
... and make sure and check and if not sure check again that the heatsink is correctly installed and the "plugs" which hold the fan in place are in the holes and plastic lugs are not bent in anyway if so remove and insert again.
Quote:
... When I power it on, the CPU fan starts turning and I immediately get a high pitched sound from the motherboard that lasts for about two seconds, then everything shuts off.
I don't believe that a bad stock HS installation would cause the squealing that is occurring.

Quote:
Second --- usb ports on front if broken will bring down a pc because if 5v goes to ground the board protects it self from booting up therefore stopping damage..
If the mobo is removed from the case then the front USB ports will not be connected.

Quote:
last but not least powersupply but i recon heatsink is not installed correctly
Again, probably not the HS mounting for above reason. Possibly PS or short or bad mobo, or even remotely, possibly CPU.
June 23, 2007 9:02:04 PM

Quote:
No, it's normal for many of todays boards to start just long enough to read configuration data from the CPU and RAM, shut down, and restart.
I agree, at this point he should let it run until it POSTs or the second reboot. It does take balls when the machine is screaming at you.
June 23, 2007 9:14:46 PM

Probably is a short circuit somewhere. What I will advise you is ask a friend of yours who has a computer with compatible motherboard for your parts. Then try them one by one on his or her computer until you find the faulty part. Don't worry it won't cause any damages.
June 23, 2007 9:28:19 PM

I could be sadly mistaken but did he say the 8800 was not plugged in to power?
June 23, 2007 9:45:34 PM

No, it's not a short circuit that's triggering that particular alarm, it's the graphics card alarm that accompanies a low power condition (such as line undervoltage or no PCI-E cable connected).
June 23, 2007 9:51:53 PM

Quote:
No, it's not a short circuit that's triggering that particular alarm, it's the graphics card alarm that accompanies a low power condition (such as line undervoltage or no PCI-E cable connected).
That's why I suggested that he power the MB with the video card removed to see if the squealing would go away.
June 23, 2007 9:58:07 PM

Someone needs to post a link to wave files for system sounds :p 
June 23, 2007 9:59:02 PM

Quote:
A possibly related question: How long will an uncooled CPU take to overheat to the point of damage? The CPU in question is an Intel C2D E6600.


Why do you ask? Did you or are you attempting to power up with no heatsink? It also sounded like you are attempting to boot with no power connected to video card. Could you please clarify?
June 23, 2007 10:20:56 PM

A similar problem occurred with my mate's new build. we simply reset the cmos and everything worked, i suggest u try that. consult your motherboard manual on how to do this if you are unsure.

A.
June 23, 2007 10:28:07 PM

Quote:
A similar problem occurred with my mate's new build. we simply reset the cmos and everything worked, i suggest u try that. consult your motherboard manual on how to do this if you are unsure.

A.
Did that build squeal, or just not boot. At any rate I made the mistake of assuming that he already did a CMOS reset but I don't see it anywhere. I have only seen boards not boot that required a CMOS reset never squealing, but there's always a first.
June 24, 2007 6:44:15 AM

I had the same exact problem (this thread: http://forumz.tomshardware.com/hardware/PC-Won-Boot-fto...) and what I did was to reset the CMOS by taking out the battery from the motherboard for a minute or two. Put it back in, plugged all the stuff back in (or you can try the basic PSU, video card, a stick of memory, CPU, Mobo) and then turned it on. Surprisingly it worked thanks to a few suggestions from the thread and now my PC is up and running.

It seemed like a complicated problem, but it was actually very simple to get it to work!
June 24, 2007 7:05:07 AM

It might need the CMOS cleared, but there's no reason to do so just yet. He first has to try to boot it, instead of shutting it off before it has a chance to do its POST.
June 24, 2007 8:02:39 AM

Quote:
Crashman: I will try connecting the 6 pin power connector to the graphics card. Will a graphics card that isn't recieving enough power shut down the system? Because if it doesn't typically do that, then there's still the issue of things starting to run for a couple of seconds then cutting off.


Wait a minute, you don't have the video card plugged into the psu :?:
June 24, 2007 8:42:25 AM

That'll teach me to not read the above....


Although i was half cut at the time.......................

mmmm stay off beer - must remember stay...... stay..... on beer

makes ugly women look good

er where was i

make sure the powersupply is connected to the video card with that 6 pin connector.......

mmmm beer ......
June 24, 2007 8:42:55 AM

We've already been through all that:

1.) It's normal for many boards to start, shut down, and start again. Especially when you have not yet entered BIOS, saved, and exited yet. He's killing the power before the system even reaches POST because he doesn't understand that this is normal.

2.) Many graphics cards won't display ANYTHING with the PCI-Express power connector unplugged, so even if the system is working "normally" he might not see anything until he connects the extra power cable.

3.) He says he hears a high pitched squeel, which he thinks is the motherboard. This is actually a normal noise that comes from 8800 series cards when the PCI-Express power cable isn't plugged in.

4.) He seems to be dealing with too many suggestions to keep track of all this. The answer would be to plug in the PCI-E connector, power the system up, and WAIT FOR POST rather than shutting down right away.

Until he does that, none of us can know if there are any other problems.
June 24, 2007 6:15:49 PM

but as pointed out here a few posts up by pinoy and by me above it seems he didn't have power plugged into video card at all
June 25, 2007 3:53:38 AM

Haven't heard from you lately. Are you still around :?: Please follow Crashmans advice and post back your results.
Quote:
The answer would be to plug in the PCI-E connector, power the system up, and WAIT FOR POST rather than shutting down right away.
June 25, 2007 4:04:14 AM

Quote:
That'll teach me to not read the above....


Although i was half cut at the time.......................

mmmm stay off beer - must remember stay...... stay..... on beer

makes ugly women look good

er where was i

make sure the powersupply is connected to the video card with that 6 pin connector.......

mmmm beer ......
Now I feel bad for being snippy. To prove my sincerity I'm now going to crack open an ice cold Becks.
June 25, 2007 5:34:23 AM

Quote:
I had the same exact problem (this thread: http://forumz.tomshardware.com/hardware/PC-Won-Boot-fto...) and what I did was to reset the CMOS by taking out the battery from the motherboard for a minute or two. Put it back in, plugged all the stuff back in (or you can try the basic PSU, video card, a stick of memory, CPU, Mobo) and then turned it on. Surprisingly it worked thanks to a few suggestions from the thread and now my PC is up and running.

It seemed like a complicated problem, but it was actually very simple to get it to work!


I swear by the battery removal method whenever my PC decides it doesn't want to recognise my hard drive.

Works every time! :D 
June 25, 2007 7:04:20 AM

Quote:
I had the same exact problem (this thread: http://forumz.tomshardware.com/hardware/PC-Won-Boot-fto...) and what I did was to reset the CMOS by taking out the battery from the motherboard for a minute or two. Put it back in, plugged all the stuff back in (or you can try the basic PSU, video card, a stick of memory, CPU, Mobo) and then turned it on. Surprisingly it worked thanks to a few suggestions from the thread and now my PC is up and running.

It seemed like a complicated problem, but it was actually very simple to get it to work!


I swear by the battery removal method whenever my PC decides it doesn't want to recognise my hard drive.

Works every time! :D There are many MB out there that will still hold up the BIOS with the Battery removed for 24 to 72 hours. Why is it so hard to follow the manual and move the CMOS reset strap or short the reset pins etc. You don't need to remove the battery, just reset the CMOS as per the instructions, as laid out in the manual for you MB :!:
June 25, 2007 7:08:52 AM

Quote:
That'll teach me to not read the above....


Although i was half cut at the time.......................

mmmm stay off beer - must remember stay...... stay..... on beer

makes ugly women look good

er where was i

make sure the powersupply is connected to the video card with that 6 pin connector.......

mmmm beer ......
Now I feel bad for being snippy. To prove my sincerity I'm now going to crack open an ice cold Becks.

MMM, becks.... Pass me 1 yeah? I guess all we can do now is wait for the OP to report back in...
June 25, 2007 7:16:40 AM

Quote:
That'll teach me to not read the above....


Although i was half cut at the time.......................

mmmm stay off beer - must remember stay...... stay..... on beer

makes ugly women look good

er where was i

make sure the powersupply is connected to the video card with that 6 pin connector.......

mmmm beer ......
Now I feel bad for being snippy. To prove my sincerity I'm now going to crack open an ice cold Becks.

MMM, becks.... Pass me 1 yeah? I guess all we can do now is wait for the OP to report back in...Unless we have been abandoned. I only have 2 Becks left, and they are in the freezer just shy of frozen.

Edit: It's a good thing you reminded me, I was slowing down and one was starting to form ice crystals.
June 25, 2007 7:29:05 AM

Quote:
That'll teach me to not read the above....


Although i was half cut at the time.......................

mmmm stay off beer - must remember stay...... stay..... on beer

makes ugly women look good

er where was i

make sure the powersupply is connected to the video card with that 6 pin connector.......

mmmm beer ......
Now I feel bad for being snippy. To prove my sincerity I'm now going to crack open an ice cold Becks.

MMM, becks.... Pass me 1 yeah? I guess all we can do now is wait for the OP to report back in...Unless we have been abandoned. I only have 2 Becks left, and they are in the freezer just shy of frozen.

Edit: It's a good thing you reminded me, I was slowing down and one was starting to form ice crystals.

LOL, I ran down to the store and grabbed my own sixxer of becks!

Here's to computers, the net, n00bz, and beer <raises bottle in salute> :lol: 
June 25, 2007 7:43:48 AM

Cheers :!: :tongue:
June 25, 2007 8:19:08 AM

I had the same problem when I was building my computer... turned out that I'd attached the HSF on the CPU loosely, and it wasn't cooling the processor. Didn't do any damage that I know of to my E6300 though... you might try reapplying thermal paste and tightening up the cooler on your CPU.
June 25, 2007 9:08:05 PM

Hey guys, sorry for coming back to the thread so late. It turns out that the squealing was in fact the 8800 GTS complaining about having an owner who forgets to plug it into the power supply with the 6-pin connector. :oops:  It also turns out that the motherboard starting, stopping, and then starting again is normal behavior, as Crashman mentioned. That, combined with the earsplitting 8800 GTS, scared this first time builder into not leaving it on more than about 4 seconds, never giving it a chance to post. After giving the graphics card some juice, it posted normally and I went on to complete the system, which runs like a dream after a comparatively minor hard drive replacement.

Thanks very much to everyone who posted suggestions or thoughts, particularly Zorg and Crashman. Building the system was quite fun and a learning experience to boot, so all ends well. Thanks again, and see you guys!
June 25, 2007 9:17:07 PM

:lol: 

I'm no genius or super educated but often I find most problems are caused by simple oversights. And you're not the first person to miss this kind of thing, and I'm sure you won't be the last.

Speaking of oversights(sorry, story time) my buddies pc melted my usb memory key! He pretty much wired the usb port backwards!

BTW, good call Crashman. Your experience led to questions that when answered got to the root of the problem quickly.
June 25, 2007 9:20:08 PM

Thanks for touching back with us. You would be surprised at the number of first-time builders who simply give up and return everything.
June 26, 2007 12:47:29 AM

Yes, good call Crashman, early in the thread as well.
!