Computer turns on and off in 1 second

My computer (which I built about 6 years ago) was overheating. So I opened it up, dusted it and removed the heat sink to check the silver. I re-silvered the heatsink and reinstalled it. When I turned on the computer, all the lights came on, the fans start, and the harddrive starts, but 2 seconds after powering up it shuts off. Any ideas?
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More about computer turns second
  1. Go through all the cables and make sure they are connected.

    It's unlikely that something coincidentally failed while you were cleaning, but it is possible. In that case:
    Our standard checklist and troubleshooting thread:
  2. `Hi followed checklist....everything seems fine, but it still turns on for a sec and then turns off. Any other suggestions?
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