How to test if CPU is fried? wont power up

cjj2d2000 · Apr 9, 2016

I have gone through numerous solutions to try and get life back in to my desktop.

Sympton: would not power up, motherboard has green light, but no components will power up.

1st attempt: new PSU, that wasnt it, should have realized that since MB was getting power this probably was not it.

2nd attempt: new memory (was wanting to upgrade memory and amount anyways) so new Corsair Dominator 16gb DDR3 RAM - still no powering up. tried all slots and numbers of sticks.

3rd attempt: new motherboard. Changed out my Intel DP55KG with an ASUS P7P55D EVO, still no powering up.

I have even tried a different power switch from another tower that I know was working, still no powering up.

Am I right to think that now I am down to just a possible fried CPU (Intel i7 socket 1156)???
I get no beeps or any sign of life at all.

Any help is greatly appreciated!

alexoiu · Apr 9, 2016

With the new board, remove the 8 pin power cable (leave the 24 one connected), connect a case fan and start the board. See if the case fan does spin.

lakimens · Apr 9, 2016

Why don't you try with a new CPU, if you think it is fried?

cjj2d2000 · Apr 9, 2016

alexoiu :

Thank you for this tip. Will try this evening after work.

cjj2d2000 · Apr 9, 2016

I do not have another 1156 CPU immediately available tovtry

lakimens · Apr 9, 2016

cjj2d2000 :

Borrow one from a friend(?), doesn't have to be i7, any 1156 will do.
You could take out the heatsink, fire it up, see if it beeps(it should beep).

GhislainG · Apr 9, 2016

lakimens :

I presume that you meant disconnect the CPU fan and not removing the heatsink.

cjj2d2000 · Apr 9, 2016

I will try these options this evening. Keep them coming if anyone has more

GhislainG · Apr 9, 2016

cjj2d2000 :

Did you test it outside of the case with only the CPU, cooler and one memory module? You don't even need a keyboard. Connect your monitor to the motherboard and temporarily jump the power switch pins on the motherboard's front panel connector. A CPU can fail, but they rarely do.

lakimens · Apr 9, 2016

GhislainG :

I meant what I said, some boards will fire up without a fan( i think), but none that I know will fire up without heatsink.

GhislainG · Apr 9, 2016

No motherboard can detect a missing cooler; they can only detect a missing or not spinning CPU fan. Remove the heatsink on your CPU and you'll have no problem powering up your system. A motherboard can detect a CPU that overheats and shut down if need be, but it doesn't beep. The Intel DP55KG has a piezo, but the P7P55D EVO requires a case speaker or piezo; otherwise it can't beep.

cjj2d2000 · Apr 9, 2016

ok, I have nothing connected except a case fan and 1 memory. I have tried with the heat sink fan connected, and without. All while the 8 pin power connector is not connected, only the 24 pin power.

When I do this, the case fan and even the heat sink fan and the fan on the psu start to spin the immediately stop.

any ideas???

GhislainG · Apr 9, 2016

cjj2d2000 :

Outside of the case? Not connecting the 8 pin cable is useless because the CPU needs it to work. Unfortunately it looks like the CPU is defective.

cjj2d2000 · Apr 9, 2016

so I have now tried it out of the case on my Intel DP55KG board with just 1 memory.

It did same thing, it started to spin, then nothing

cjj2d2000 · Apr 9, 2016

I did notice a smell came from the board/cpu when I was able to get the case fan, heat sink fan, and psu fan try to spin then stopped.

cjj2d2000 · Apr 9, 2016

so both motherboards when tested barebones show the same symptom??...????
I know its rare, but I can't think of anything else other than the CPU. am I wrong in thinking this?

GhislainG · Apr 9, 2016

You tried two PSUs, two motherboards and you probably tried two memory modules. That doesn't leave much else but the CPU.

cjj2d2000 · Apr 9, 2016

Same CPU, just tried it in two different boards, both with brand new memory modules, two different PSU's one old and one brand new, and same symptoms

GhislainG · Apr 9, 2016

How did the issue start? Did the PSU fail? Have you considered returning the Asus motherboard and building a new system using current components?

cjj2d2000 · Apr 9, 2016

This all began when I went in to office one day and computer was off, pressed power button and it made a noise like it was about to start up then just died. this was:
Intel DP55kg board
i7 870 cpu
4gb DDR3 Ram

I thought it was the PSU, and instead of investigating, just ordered a new PSU. Replaced it and still nothing, no life to it at all. nothing would power up, but the board still had the green light on it, but that was it.
I ordered new memory, simply cause I wanted to upgrade memory and have more. So I ordered 16GB DDR3 Corsair Dominator RAM.
I then ordered the ASUS P7P55D Evo board.

Put new PSU, ASUS board, New Memory, and same i7 cpu. still nothing!!!

I tried going bare bones with just memory, cpu fan, and case fan. They all started to spin then immediately stopped. (This happened using both boards, in and out of case)

so this is where I am at. I have 2 different boards available, brand new memory, brand new PSU (and a old one that works just fine I found out) and the i7 CPU.

GhislainG · Apr 9, 2016

I presume that 16 GB kit is made of two 8 GB modules? What will you do?

cjj2d2000 · Apr 9, 2016

yes, 2 8gb modules

GhislainG · Apr 9, 2016

That's good. Will you buy another socket 1156 CPU? At least they are not expensive.

cjj2d2000 · Apr 10, 2016

most likely that looks like the next approach.

cjj2d2000 · Apr 10, 2016

any other thoughts/ideas?

How to test if CPU is fried? wont power up

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