While off, computer suddenly powers on.

Hello, While off, my computer (Dell Optiplex 755) suddenly powers on and two seconds later powers off again. This happens every 20-30 minute 24/7. Any ide why it does this?

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More about while computer suddenly powers
  1. Check bios for wol (wake on lan) and windows advanced power settings, sleep->wake up timers.
  2. my old 745 did this but i had a bad board!!!!!
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