Computer Dead, I suspect it is the CPU

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olafgarten

olafgarten

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Dec 16, 2011
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Hi, yesterday, I was playing ETS2, when suddenly my computer switched off and then wouldn't turn on. I have tested the psu and that works, and there are some lights on the motherboard which indicate the EPU and TPU are on. I think it is the cpu that is broken. I have tried replacing the cos battery and removing pci cards and any unnecessary connectors from the PSU.

My specs are as follows.
CPU: Intel Core i7 2600k
Motherboard: ASUS P8P67 PRO REV 3.0
GPU: EVGA Nvidia GTX580.

I would like some suggestions of other things I can test or maybe ways to fix it.

Thanks,
Olafgarten.
 
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Chicano

Chicano

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Aug 29, 2011
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1 Check all power connections... that's: From power cord to PSU, to PSU to motherboard, to CPU, to disk drives.

2 Try a different PSU to make sure it's not the problem... Reason is that PSUs may appear to be good but may not be.. They may even register the right voltages in a voltmeter but not meet the right amperage. So, the only way to know for sure is with the appropriate tester or with a replacement.

3 CPUs rarely break, RAM also, and if RAM were the problem you would hear BIOS beep codes.. Bad PSU doesn't cause beeps nor video and may or not run the fans including the PSU fan.

4 Another possible cause is dead motherboard... you can have the same as point 3 symptoms. Running PSU but no video, fans may or not run, or run slowly, No BIOS beeps or unidentifiable beeps.
 
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Chicano

Chicano

Judicious
Aug 29, 2011
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Did you test the PSU separately jumping the green to black wire terminals?.. If so, you next need to test the motherboard, jumping the motherboard power switch header pins. See the image and/or download the motherboard user manual. You should remove the power switch connector to expose the 2 power pins on the motherboard front panel header, and with a small screwdriver or suitable wire, paper clip, etc., jump the two pins for a second and remove the improvised jumper. If the switch is the problem, the computer should start normally.. if the motherboard is the problem, jumpstarting it will not make a difference.

Manual download
http://www.asus.com/Motherboards/P8P67_PRO/HelpDesk_Manual/

ASUS P8P67 PRO REV 3.0 front panel header
mlawm.png
 
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Chicano

Chicano

Judicious
Aug 29, 2011
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35,490
I should clear up two ovservations: motherboard leds turning on before you switch the computer on is normal. And if the power switch is stuck or shorted out, the computer can start normally but turn off a few seconds later... the same happens if you jump the power switch header pins, and hold the improvised jumper on... the computer will start and turn off a few seconds later. This ON and OFF behaviour you are experiencing is similar to what I describe, therefore I suggest jumping the power pins inplace of the power switch, to isolate the switch and understand better what is going on. It would be about the same as breadboarding the motherboard but without ruling out the motherboard making contact with the case. That part you can verify visually with a small mirror you can use to view the underside of the motherboard separation from the case to make sure nothing is lodged and shorting out the motherboard to the case. This so you don't have to remove the motherborad for inspection.
 
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B

bmacsys

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Jul 4, 2013
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Processors are usually the least likely component to suddenly go bad. Remember it is a solid state device. While the psu is the most likely component to fail. What testing did you actually do to verify the psu is good?
 
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