Replaced heatsink now wont boot!???

i just replaced the heatsink on my computer from the stock Athlon to the stock with black edition, (i know, a small upgrade but still better than before) but now it wont boot at all, not even to bios. the case light and all fans come on but thats about it. I built this about a year ago and have had no problems prior to this.

System build:

1 x Athena Power CA-1015CR30 Red / Black Steel MicroATX Desktop / MicroATX Slim Computer Case 300W Power Supply

1 x GIGABYTE GA-MA785GM-US2H AM3/AM2+/AM2 AMD 785G HDMI Micro ATX AMD Motherboard

1 x AMD Athlon II X3 450 Rana 3.2GHz Socket AM3 95W Triple-Core Desktop Processor ADX450WFGMBOX

1 x ADATA 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model AD2U800B2G5-DRH

1 x SAMSUNG Spinpoint F3 HD502HJ 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

1 x SAMSUNG 22X Half-Height DVD Writer Black SATA Model SH-S223L LightScribe Support - OEM
8 answers Last reply Best Answer
More about replaced heatsink wont boot
  1. Make sure that the heatsink is seated in fully.
  2. Did you loosen the cpu power connector that is near the cpu socket or any other power connector , because it does sound like that could be the problem. Is the heatsink the only thing that you replaced and you did not take the cpu out of its socket. Make sure that the ram is seated all the way in and you didnot loosen it as well. By replacing the heatsink there are a few things in the area of it that you could have accidently touched and loosened and didn't realize it.
  3. when removing the old heatsink the cpu did pop out, since they use the same hardware i did not have to remove the motherboard or any other connections, if i remove the heatsink to re-seat the cpu will i need to replace the grease? its only been on for a day
  4. Sounds like you could have damaged your CPU. It shouldn't pop out when removing the heatsink. Look at the CPU and make sure all the pins are ok.

    Also, you always need to replace the grease after taking it out. (My opinion)
  5. yeah the old grease was more like glue than grease, i did inspect the pins when i put got it out and did not notice any problems but i can check again
  6. Best answer
    I suggest reseating CPU (carefully) and then applying pea sized grease or however you apply it then make sure you seat the heatsink in good and fully. Try to boot up.
  7. Best answer selected by offroadyota.
  8. i pulled the cpu out, none of the pins were bent then i made sure it was seated properly and now it boots up just fine. thanks for the help!
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