Custom build not starting

My custom build pc, won't start, it turn on and all the fans spin, but then turns off after 5 seconds.
What could be the problem?
2 answers Last reply
More about custom build starting
  1. List your full specs please. Also, check that all of the plugs and parts a fully seated into the motherboard.
  2. have you used stand off between the mobo and tray?
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