Computer cannot start!

Hi guys

Just nought a new PSU. I installed everything, and when I press the case's button the computer doesn't start. It just flashes for half a second, and that is it. The power light on the mobo is on. Please help

Cheers!!
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More about computer start
  1. Hi guys,. Fixed the problem. Took the cards out of the motherboard, screwed the screws better and put just one of the two GPU's back. My pc is well and running
  2. Does that mean you didn't install the MB standoffs the first try?
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