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Computer won't start unless I flip power supply off and on again...

Last response: in Components
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April 26, 2011 5:40:37 PM

Well, recently my custom rig has starting being a bit temperamental. Everything is running perfectly fine and dandy, except that when I try to press the power button, nothing happens often times. So, I turn the back main power switch on the power supply off, then on again, and then it will boot up. Sometimes it doesn't do this and starts right up when I try to power it up from shut down, but it's been not powering up more and more.

Why is this? Is it my power supply? I'm pretty sure I have ample power for my rig, since it's 800 watts, and it has never given me problems before. And it works beautifully when it DOES power up after the switching. I'm really quite mystified and hope this isn't pointing to an even bigger problem.

My specs are as follows:

Q6600 @ 3Ghz
4GB Patriot 800Mhz RAM
EVGA Geforce 570GTX
Asus Essence STX sound card
FSP Everest 800w power supply
Thermaltake Armor series case.

Thanks for reading everyone, and I would really appreciate any input!
a b ) Power supply
April 26, 2011 6:27:40 PM

Swap the power on / reset connections to the motherboard to rule out case buttons or cable short, after that, do above to rule out psu, then start looking at mobo.
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April 29, 2011 6:29:03 PM

Well, my computer will officially not start now. I just did the paper clip test, and the PSU starts up with the case fans attached just fine. I looked at all the connections on my Mobo, and I didn't see anything amiss, and since that I hadn't touched it in between the time it was fine and the times it started acting funny, I can't imagine it being any sort of wire or connection issue.

Any other thoughts on what could be causing this? Is it possibly my CPU now or, what?

Also I should note, as soon as I was done with the paper clip test, I tried turning the computer on after I reconnected everything, and it turned on for a second or two, then shut back down and, again, will not start up.
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May 1, 2011 4:34:23 AM

As much as I hate to bump my own post, I am quite baffled at this problem, and would really appreciate any feedback. Thanks!
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a c 274 ) Power supply
May 1, 2011 12:27:42 PM

Try jump starting your mobo with a screw driver on the fp power header.
Remove the case switch power leads.
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May 3, 2011 2:06:19 AM

By fp do you mean front panel? Pardon my ignorance, but my hardware knowledge is limited. And how would I go about jump starting it with a screw driver? If you're talking about the 24-pin power connector, then I honestly can't see how I would "jump start" it.

If you could clarify how this is done, I'd be much obliged!
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a c 274 ) Power supply
May 3, 2011 2:21:11 AM

Yes, i'm referring to the front panel power header on your mobo.
Take the two case power button leads off.
touch both pins with a screwdriver.
if your pc powers up good
if you put the leads back on and depress case switch and it doesn't work.
look at the case switch
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May 3, 2011 2:30:43 AM

Well, to the best of my ability, with some instructions from a video, I went in, disconnected the leads for power and reset, and tried touching the two pins for PWR or whatever with the screwdriver, the PSU was switched on, and nothing happened. Does this mean my Mobo has bitten the dust?
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a c 274 ) Power supply
May 3, 2011 2:38:58 AM

Sounds like it to me unfortunately!
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May 3, 2011 3:11:22 AM

So, there's no way that is could be the RAM, or the CPU, or something else? Because, if this is the problem, than I want to get it back up and running ASAP, so I don't want to buy something new that won't solve my problem.

Thanks so much for all of your help!
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a c 274 ) Power supply
May 3, 2011 4:20:23 AM

Does your mobo have solid capacitors or old style?
Inspect your mobo for blown caps.
They'll be either leaking gunk or bulged at the top.
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May 3, 2011 6:24:07 PM

My mobo is a Gigabyte X38DQ6, and it uses solid capacitors, and after taking a look, they all look well and in order: no bulging, no leaking. *Sigh*
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a c 274 ) Power supply
May 3, 2011 8:23:26 PM

Did you get any type of a response from the mobo(fan spin,leds,etc..) when you jumper started the pins?
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May 4, 2011 12:51:48 AM

Nothing. I'm 99% sure I was hitting the right pins, and nothing happened. And yes, the power supply was on. Soo...
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Best solution

a c 274 ) Power supply
May 4, 2011 1:33:43 AM

Unfortunately that means the mobo has died!
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May 4, 2011 2:19:39 AM

Alright, well it's nice to know what the issue is. I guess I'm fine with that, since I've had it for about 4 years and have gamed the hell out of it!

And it was quite teasing how the computer turned on, then off. I would switch off/on the PSU switch, then it would start up, and run fine until I shut it down the final time, when it just didn't start. Ugh!

Well, I guess I'll get a new Gigabyte board, since it has served me well, and possibly get a new processor...

Thanks again so much for your help, Davcon!
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May 4, 2011 2:19:50 AM

Best answer selected by Krovonrock.
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a c 274 ) Power supply
May 4, 2011 2:53:46 AM

Krovonrock said:
Alright, well it's nice to know what the issue is. I guess I'm fine with that, since I've had it for about 4 years and have gamed the hell out of it!

And it was quite teasing how the computer turned on, then off. I would switch off/on the PSU switch, then it would start up, and run fine until I shut it down the final time, when it just didn't start. Ugh!

Well, I guess I'll get a new Gigabyte board, since it has served me well, and possibly get a new processor...

Thanks again so much for your help, Davcon!

I guess it was it's way of telling you it's time for an upgrade.
775 is kinda long in the tooth considering what's available these days.
That being said i strongly advise you to have the psu's voltages checked out at a reputable pc shop before you spend any money on a new platform.
Your psu is not considered very good electrically.
Voltage regulation on your unit is sub-standard according to this review.
http://www.hardwareheaven.com/reviews/833/pg1/fsp-evere...
It may no longer be providing the proper voltage to power your mobo and/or has subsequently damaged it.
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May 4, 2011 4:33:53 PM

Very well, I'll get that checked out. Thanks!
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May 6, 2011 6:59:54 PM

What I think I will actually do, since there are no reputable pc repair shops around, is just buy a new and more reliable Corsair PSU, since regardless whether it's my PSU or Mobo, I'm going to get a new PSU anyway, since I will want something more reliable. So I'll get a new one, try it out, and if it does not work then I'll know it's the Mobo!
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May 22, 2011 6:40:52 PM

Good news! It was not the Motherboard, but the PSU! I got a new Corsair 850w PSU that is known to be very good, hooked it up, powered it up, and my computer works like a dream! I guess 4 years of hard labor took the wind of my old PSU's sails. But the best part is it was only a $150 repair!
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