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Black screen, no POST, suspecting a dead CPU...

  • CPUs
Last response: in CPUs
April 7, 2011 6:43:57 PM

Hey everyone,

Ok, i bought a new HSF(Noctua D14) for my Phenom II X4 955. I had problems removing the stock HSF however(the thermal gum that comes on AMD heatsinks is like super glue, seriously) and i pulled the heatsink from the mobo with the CPU still intact. I think i didnt bend any pins, but when i tried to get it loose i used all sorts of stupid methods like blowing with a hairdryer and even putting it in the freezer in a zip bag. Read on some forums that suggested that... :??: 
Anyway, i got the HSF off by wiggling it vigoriously, and i think i got it properly in place when installing the Noctua. However now that i power it up, fans are spinning but no POST and no HDD activity. Only a solid green light on the mobo just indicating powerup(according to mobo manual). Now im just really angry that i was stupid enough to do the freezer trick because there was some condensation when i took it out, and thats what i think its the problem.

Any suggestions before buying a new CPU?

CPU AMD Phenom 2 X4 955 BE
RAM Kingston 2X2GB DDR3 1333mhz
GPU Sapphire HD6850
PSU Xigmatek NRP PC-602 600W
HDD Samsung Spinpoint F2 1TB
OS Win7 64-Bit

More about : black screen post suspecting dead cpu

April 7, 2011 6:48:00 PM

The easiest method to remove a heatsink is to run the system at full load for about 20minutes. This allows the thermal paste to become less solid and makes removal much easier.

Putting the CPU in a freezer was probably a very stupid idea as it would make it more difficult to remove.
April 7, 2011 6:49:41 PM

The idea with the freezer was to make the TIM brittle so it could easily be cracked off...

EDIT: Would anyone have ways on how to test if the CPU really is dead?
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April 8, 2011 2:35:39 PM

About the only way to test a CPU is by substitution. You either put the questionable CPU in a working system or you replace the questionable CPU with a known good one.
April 8, 2011 3:51:23 PM

Oh ***, i forgot to plug that little 4-pin 12V to the top of the MB... Got it back on and now it boots.