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PC randomly shutting down after inspecting the CPU

I recently went to look inside my PC for the CPU. ( was trying to put my old CPU into my new PC so that I could boot up and install the new BIOS that would accept my new CPU - not important)

I put it back together again, applying a tad more thermal paste as the old application had gone dry. After trying to boot up again, the load up takes much longer than usual and before it gets to the sign in screen the PC will die without any warning. I went back in to make sure that the CPU cooler had been put back securely and nothing has worked.

I also tried keep the PC at the boot menu to see if the loading process was causing the crash, but it still died after a few minutes.

Basically - What have I done wrong? Any information would be useful! Thanks!
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  1. Best answer
    Did you clean off the old paste with alcohol? If not the dry paste is holding the heatsink off the cpu and causing it to overheat. Make sure you plug the cpu fan back into the cpu header.
  2. elbert said:
    Did you clean off the old paste with alcohol? If not the dry paste is holding the heatsink off the cpu and causing it to overheat. Make sure you plug the cpu fan back into the cpu header.


    No I didn't that will probably be it! Thank you! What alcohol can I use to get rid of the old paste? Anything clear and strong or something more professional?

    Edit: I did plug the fan back it, it was spinning normally.
  3. Use isopropyl alcohol and the stronger the better.
  4. Just regular rubbing alcohol works fine. Just take you time getting it off the CPU and heatsink. Then reapply fresh paste about a pea sized amount.
  5. elbert said:
    Just regular rubbing alcohol works fine. Just take you time getting it off the CPU and heatsink. Then reapply fresh paste about a pea sized amount.


    Thank you for your help! I'll update if it works!
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