I changed my cpu fan and now my computer wont boot

Hello, I recently had to change the psu in my friend's computer and had no problems with it until I had to change the cpu fan/heatsink. Now the computer will turn on but will not boot. All fans and everything spin but nothing on the screen. I have tried changing video cards but get the same thing...no signal to the monitor...any suggestions?
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More about changed computer wont boot
  1. recheck all your cable to see if you did not forget one also look for the one that power the graphic card
  2. graphics card power cable(s) and CPU power cable are the two most common cables to get neglected during reassembly - like scout says, check those first. If all is good there, we can go to the next step... POST, does the computer make any beeping noises when turned on?
  3. Make sure that the CPU fan is installed in the CPU fan header. POST checks for a signal on that header and won't boot without it.
  4. Is it possible that you dislodged the cpu, i now its unlikely but it worth a stab at.
  5. Disconnected all wires and re-seated them. Cpu is in place firmly. No beeps at all when turned on. Same blank screen.
  6. Do you have a different PSU you could try - even low wattage?
  7. What are your system specs? Did you verify that there is a fan plugged into the CPU_FAN header on the motherboard?
  8. Its an old computer...I am trying to get my hands on a lower wattage PSU. Everything is plugged in and seated. This only started happenning after i changed out the cpu fan and heatsink. I tried to put the old one back in and it did the same thing.
  9. Thanx all, but i figured out that the hard drive must be corrupted as I plugged it into another pc and it wouldnt boot either. Time to buy new.
  10. drjerms said:
    Hello, I recently had to change the psu in my friend's computer and had no problems with it until I had to change the cpu fan/heatsink. Now the computer will turn on but will not boot. All fans and everything spin but nothing on the screen. I have tried changing video cards but get the same thing...no signal to the monitor...any suggestions?

    pull the cpu out and check for bent pins.
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