Help, My systems won't boot

I've recently replaced my heat sink fan inside my computer after doing so, my PC has refused to boot, It wont even connect with the monitor, at first i booted and the fans would all work but now it restarts after about 4 seconds.

I need to solve this problem, but I'm unsure of what the problems is, go easy I'm new.
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More about help systems boot
  1. Possibly somethig was dislodged/disconnected during the fan switch. So it turns on, with no signal on the monitor, then shuts off after 4 seconds?
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