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How to tell if CPU is dead?

Last response: in CPUs
December 19, 2011 10:53:43 AM

hello Dear Community :) 

Yesterday My PC refused to turn on. At first it booted for 5 secs, then turned off. After that, no matter what I did it just turns on for like 100 milliseconds (moves fans a little) and goes instantly off. Tried resetting CMOS, tried pulling out hdd's, vga, rams, piece by piece but it stays the same - turn on for a super short period and instantly off. I tried changing the PSU - and yet again its the same. So now the problem either on motherboard or either CPU. I dont have a spare lga1155 cpu to test it, and I dont have a friend who has an lga1155 one.

So the question is - how to find out which is defected - Mainboard or CPU ?

My rig:
Asus P8P67 motherboard
Intel 2600K (ran @ 4,2 ghz on turbo)
16 gigs of corsair vengeance
64 gb ocz ssd + 1gb hdd
700W OCZ power supply

Thank you.

More about : cpu dead

a c 159 à CPUs
December 19, 2011 11:02:00 AM

This checklist and related links might help. If it still won't post after disconnecting all drives and trying each ram stick one at a time, request an rma from asus. Pack the board carefully to prevent damage. It usually takes 2-3 weeks to get a replacement.
a b à CPUs
December 19, 2011 11:14:22 AM

Had a similar problem, after 1 month usage in brand new PC.
Even the 100 milliseconds on with fan moving a little before turn off.

Conclusion: dead Asus P8P67 Pro.
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a c 172 à CPUs
December 19, 2011 11:32:27 AM

adomolis said:
So the question is - how to find out which is defected - Mainboard or CPU ?

The only way to tell for certain is by substituting known good parts.

Disconnect everything from the motherboard except the PSU, CPU and heatsink, case speaker, and power switch. If those few components are working properly, you should hear long single beeps from the case speaker, signifying missing memory.

Silence indicates, in probable order, a bad PSU, motherboard, or CPU. You have already tried a different PSU. CPU's seldom fail and you have tried a diferent PSU, so the next most likely suspect is the motherboard.
December 19, 2011 12:20:06 PM

Yeah... I guess its motherboard then. Anyways, the Sandy Bridges are said to be very reliable and even on shittiest circumstances when others fail, it still keeps working. I'll just send the MB for warranty.