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Computer will not start. New mobo did not fix problem

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shaun54   08-04-2009 at 11:06:51 AM

Hey,
My computer recently broke after about 20 months. It is a computer i built with the help of some of the forum users of toms hardware. Anyways, when i first tried turning on my computer (it was working 4 hours before that) notthing powered on.
No case lights, no fans, no notthing.
I bought a new PSU to find that it did not help my problem. I also tested my old PSU to check that it works by shorting the green and black wire in the atx connector and watched my case lights and fans come to life.
I then ordered a new motherboard and PSU tester (i just wanted to make sure the psu wasnt over volting the mobo).
After hooking everything up to the new motherboard and testing the old PSU (again) i proceeded to turn on the computer....i got no response from the case lights/fans/anything.
I also checked that the power switch was in working condition, which it is...

Anyways, Does anyone have an idea what may be the problem? i am guessing the CPU i have is broken and needs replacing.
I just wanted to get some opinions about possible solutions to the problem before i shell out a couple hundred more dollars.

Thanks for your time! :hello:

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hefox   08-04-2009 at 11:21:21 AM
- 1 +

Even if your CPU would be broken, you should at least have the motherboard's lights on. I suggest you take everything out from your case and try build it on a table and see if is working. It might be a short-circuit.

Message quoted 2 times
Message edited by hefox on 08-04-2009 at 11:21:46 AM
------------------------------ Intel i7 920, Gigabyte X58-DS4, 3x1 Corsair DDR3 1333, XFX 260 GTX
Samsung 750Gb F1,Samsung DVD-rw, Hiper Type-M 880W, Coolermaster HAF 932, Logitech Z-5500
 Reply to hefox
apache_lives   08-04-2009 at 11:38:21 AM
- 0 +

specs?

------------------------------ Q6600@3510/1560 + TT BigTyphoon+Mod
8gb Kingston 800mhz
Gigabyte EP35-DS3P
XFX 8800GT/512
 Reply to apache_lives
amnotanoobie   08-04-2009 at 12:18:29 PM
- 1 +

Try booting without RAM and your video card, if it doesn't even beep then the motherboard could be DOA.

Before trying the next steps, try cleaning the gold contacts of your ram and vid card with a pencil eraser, and blowing air on the ram slots and vid card slot. (Just make sure that no eraser bits remain on the contacts before you try to insert it.)

1. If it does beep (I'm not sure of the pattern though), kill the power, insert one stick of ram.
2a. If the pattern of beeps change, kill the power then insert the vid card and boot again. If after that the pattern of beeps do not change then it might be the vid card that's the problem.
2b. If the pattern of beeps do not change, try pulling out the ram then insert the vid card, then boot. If the pattern of beeps change then it might be the ram that's bad.

After that I think it should work, else you should provide more info.

Reply to amnotanoobie
sepayne21   08-04-2009 at 02:39:02 PM
- 0 +

most motherboards cases have stand off screws that you screw into the case; from there, you mount your mobo to those stand off screws so your motherboard doesn't short circuit to the case. check to see if your case has stand off screws.

Message quoted 1 times
Message edited by sepayne21 on 08-04-2009 at 09:27:43 PM
Reply to sepayne21
HardwareSexFan   08-04-2009 at 02:41:16 PM
- 0 +

Have you tried turning it off and on?

Hope you have awesome luck with that :D

------------------------------ I like good hardware and I can not lie. You other hardware fans cant deny. When a processor walks in with its itty bitty micro parts. And it farts right on your face. YOU GET SPRUNG.
 Reply to HardwareSexFan
softwarefiend   08-04-2009 at 02:41:49 PM
- 0 +

maybe ur compluter is dammaged :fou:

Reply to softwarefiend
chunkymonster   08-04-2009 at 02:52:27 PM
- 0 +

If you rec'd a new mobo and are having the same problem as before you replaced it, chances are it is not an actual hardware issues but most likely PEBKAC. [rant]Been noticing a lot of mobo reviews on Newegg lately with reviewers stating that the mobo is DOA and would not start but from reading the description of their problem it totally smells of n00b mistakes and/or PEBKAC.[/rant]

sepayne21 wrote :

most motherboards have stand off screws that you screw into the case; from there, you mount your mobo to those stand off screws so your motherboard doesn't short circuit to the case. check to see if your case has stand off screws.

Not only must you use the mobo standoffs, but experience has taught me to put little paper or plastic washers between the standoffs and the mobo as an extra cushion of insulation to eliminate any possible electric shorts.

Ensure that the proper power connectors are firmly seated, the 20/24 pin ATX power connector as well as the 4/8 pin 12v power connector.

Verify that the 2 pin case power button connector is connected correctly. Not all mobo manuals are clear on which is the + or - pin on the mobo, and btw; the red wire gets connected to the + pin on the mobo.

As Apache asked, what are your specs? Specifically what make and model of mobo, memory, proc, gpu, and brand and wattage of psu.


Message edited by chunkymonster on 08-04-2009 at 02:54:47 PM
Reply to chunkymonster
shaun54   08-05-2009 at 09:09:04 AM
- 0 +

hefox wrote :

Even if your CPU would be broken, you should at least have the motherboard's lights on. I suggest you take everything out from your case and try build it on a table and see if is working. It might be a short-circuit.



Wow...The last thing i that i would have guessed would be wrong was wrong.
i reassembled my setup outside of the case and it worked...i also removed one of the stand off screws and i believe that fixed my problem.
now i have a spare mobo...im so glad i asked for some advice here, if not i would have an extra cpu as well.

Thanks again guys...i feel silly now...haha

Message quoted 1 times
Reply to shaun54
ainarssems   08-05-2009 at 11:52:33 AM
- 0 +

Quote :

Verify that the 2 pin case power button connector is connected correctly. Not all mobo manuals are clear on which is the + or - pin on the mobo, and btw; the red wire gets connected to the + pin on the mobo.



there is + or - for power switch. all it does is connects both.

Reply to ainarssems
Bronze CPUs badge jsc   08-05-2009 at 12:21:59 PM
- 0 +

chunkymonster wrote:
Not only must you use the mobo standoffs,
True. Everywhere there is a hole, you should have a standoff.

but experience has taught me to put little paper or plastic washers between the standoffs and the mobo as an extra cushion of insulation to eliminate any possible electric shorts.
Not needed. The little sunflower shaped bare pads surrounding the motherboar holes on both sides of the board are tied together. When you put a screw in to secure the motherboard, you are also grounding it.

Verify that the 2 pin case power button connector is connected correctly. Not all mobo manuals are clear on which is the + or - pin on the mobo, and btw; the red wire gets connected to the + pin on the mobo.
Power and reset switches are not polarized. They have polarity markings, true, but the markings do not matter.

As Apache asked, what are your specs? Specifically what make and model of mobo, memory, proc, gpu, and brand and wattage of psu.
Yes, need specs.

Boot problems and new build checklist in case you haven't seen this:
http://www.tomshardware.co.uk/foru [...] _13_0.html

Reply to jsc
geofelt   08-05-2009 at 05:39:04 PM
- 0 +

Good job on finding the problem shaun54.

I would not have thought that after 20 months of operation that some sort of a short would appear. Had the case been moved enough to cause this? Some motherboard shorts have been caused by using the wrong sets of screws to secure the notherboard. They used the ones with larger heads instead of the smaller ones.

Reply to geofelt
TechnologyCoordinator   08-05-2009 at 05:45:03 PM
- 0 +

hefox wrote :

Even if your CPU would be broken, you should at least have the motherboard's lights on. I suggest you take everything out from your case and try build it on a table and see if is working. It might be a short-circuit.



shaun54 wrote :

Wow...The last thing i that i would have guessed would be wrong was wrong.
i reassembled my setup outside of the case and it worked...i also removed one of the stand off screws and i believe that fixed my problem.
now i have a spare mobo...im so glad i asked for some advice here, if not i would have an extra cpu as well.

Thanks again guys...i feel silly now...haha



Hefox FTW! Nice job guys.

------------------------------ jennyh wrote: AMD break-even Q4 2009. *Gauranteed*

RabidFanboysSpreadingFalse.Info
 Reply to TechnologyCoordinator
hefox   08-05-2009 at 06:02:52 PM
- 0 +

Thank you.

------------------------------ Intel i7 920, Gigabyte X58-DS4, 3x1 Corsair DDR3 1333, XFX 260 GTX
Samsung 750Gb F1,Samsung DVD-rw, Hiper Type-M 880W, Coolermaster HAF 932, Logitech Z-5500
 Reply to hefox
HundredIslandsBoy   08-05-2009 at 06:30:43 PM
- 0 +

Did you try to power on by directly shorting the motherboard front panel power on pins using a screwdriver?

Message quoted 1 times
Reply to HundredIslandsBoy
AMDThunder   08-05-2009 at 11:15:24 PM
- 0 +

HundredIslandsBoy wrote :

Did you try to power on by directly shorting the motherboard front panel power on pins using a screwdriver?




Please read threads before you reply. Already resolved.

That is all.

------------------------------ Phenom II X4 940 @ 3.4
GIGABYTE GA-MA790X-UD4P
2X2GB/ G.Skill PI Black PC6400
HD4770 XFire
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