Computer keeps restarting before post

[owenattard]

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

 

[xtreme5]

reset CMOS. Have you applied thermal paste on the CPU.

 

[owenattard]

i already tried that :S i think it is either psu, mobo or cpu :S

 

[xtreme5]

reseat the cpu.

 

[owenattard]

i just tried still not working :S

 

[owenattard]

may the psu be faulty ?

 

[Curtis772]

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.

 

[owenattard]

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

 

[Curtis772]

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-Series/ProSeries-850W-PSU/850W-Core-Edition-Full-Wired-Bronze.aspx

 

[owenattard]

so you think its a psu problem ?

 

[Curtis772]

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.

 

[owenattard]

it powers up for few milli seconds then restarts :S the light on the mobo is on :S

 

[xtreme5]

test with other PSU.

 

[dudewitbow]

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.

 

[Onus]

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.

 

[owenattard]

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

 

[eggbrook]

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.

 

[owenattard]

i borrowed a psu tester and th - 5v is not light that means the psu is not good right ?

 

[xtreme5]

ahh! so i was right!!

 

[owenattard]

so if -5v does not light up it isnt good ?

 

[xtreme5]

yep.

 

[Onus]

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.

 

[owenattard]

ye just cheked it doesnt have i am betting its the mobo :S

 

[Onus]

Have you checked for a short in any of the switch wires?

 

[owenattard]

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