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Computer keeps restarting before post

Last response: in Systems
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June 29, 2012 10:08:44 AM

hello yesterday i used my pc normally and today when i tried turning it on it keeps restarting before it posts anything. I tried booting up with only the mobo, cpu, psu and one ram . i tried both ram since i have two still it would not turn it keeps turning on and then restarting. The fans when truned on spin around for few mili seconds and the turn off and the process starts again. the lights on the motherboard are light also. Also this is my first build so dont have spares.

My specs are
MOBO : Asus P8Z68-V PRO
CPU: Intel® Core™ i7-2600K Processor (8M Cache, up to 3.80 GHz)
psu: XFX Core Edition Pro 850W
Graphics card : sapphire HD Radeon 7950 3gb
Ram : Corsair 8GB DDR3 1600Mhz
harddisk: WD 500 gb
June 29, 2012 10:20:43 AM

reset CMOS. Have you applied thermal paste on the CPU.
June 29, 2012 10:23:21 AM

i already tried that :S i think it is either psu, mobo or cpu :S
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June 29, 2012 10:24:37 AM

reseat the cpu.
June 29, 2012 10:32:13 AM

i just tried still not working :S
June 29, 2012 10:39:53 AM

may the psu be faulty ?
June 29, 2012 1:16:04 PM

After resetting CMOS did you 'load optimized defaults' in the bios?

Just to confirmed, you tried with just the psu, 1 stick of mem, cpu, cpu fan, and gpu only? No other fans or the HHD. does it POST?

If you can get your hands on another PSU I'd defiantly give it a try.
June 29, 2012 2:07:52 PM

it is not even starting :S it just turns on the cpu fans turn and then it resets with out any image displayed and ye i tried removing everything just leaving those things now i am think that it may be a psu problem cause last monday whenever i played a game the whole screens turn black and no signal is displayed :S and now it wont even start
June 29, 2012 2:22:33 PM

owenattard said:
it is not even starting :S it just turns on the cpu fans turn and then it resets with out any image displayed and ye i tried removing everything just leaving those things now i am think that it may be a psu problem cause last monday whenever i played a game the whole screens turn black and no signal is displayed :S and now it wont even start


XFX's site states their PSU's have a 5 year warrenty (under the Features tab). I'd give them a call.

http://xfxforce.com/en-us/Products/Power-Supply/XFX/Pro...
June 29, 2012 2:24:51 PM

so you think its a psu problem ?
June 29, 2012 2:31:58 PM

It sounds like the PSU if the rig will not power up. If you have a buddy that will allow you test your PSU in his rig or his PSU inyour rig, you can give that a try. But in my opinion it's the PSU.
June 29, 2012 2:34:20 PM

it powers up for few milli seconds then restarts :S the light on the mobo is on :S
June 29, 2012 5:25:12 PM

test with other PSU.
a b B Homebuilt system
June 29, 2012 5:38:04 PM

recheck all the connections from every component and the wall as well. you can also try taking out the mobo and trying to turn it on on a non-static surface.
a b B Homebuilt system
June 29, 2012 5:45:10 PM

Disconnect the mobo's power and reset switches; they or their lines might be shorted. See if you can then start it by momentarily shorting the power switch pins with a screwdriver or paperclip.
June 29, 2012 6:13:47 PM

ok thx for all the help on monday i am going to my friend to test my pc i will tell you my results thx for all the help
June 29, 2012 6:26:37 PM

This is likely a long shot, but what this sounds like is a short. Make sure that the only motherboard mounts in the case are the ones the motherboard screws into and that there is no metal touching the board. This is a long shot but it sounds like something I dealt with several years ago.
July 2, 2012 3:52:06 PM

i borrowed a psu tester and th - 5v is not light that means the psu is not good right ?
July 2, 2012 4:00:29 PM

ahh! so i was right!!
July 2, 2012 4:17:49 PM

so if -5v does not light up it isnt good ?
July 2, 2012 4:20:18 PM

yep.
a b B Homebuilt system
July 2, 2012 4:57:57 PM

No! -5V is an obsolete rail. It was dropped from the spec years ago. Most modern PSUs don't have it; check the label on it.
July 2, 2012 5:46:28 PM

ye just cheked it doesnt have i am betting its the mobo :S
a b B Homebuilt system
July 2, 2012 6:50:44 PM

Have you checked for a short in any of the switch wires?
July 2, 2012 10:02:17 PM

ye i have :S i am going to take the pc to repairman thats the best i can do :S dont have spare parts
!