Discrete graphic card can't start up?

My discrete card (geforce 8400 gs) can not start up when I turn on the computer even after I disable my integrated on-board card. Please help me!
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More about discrete graphic card start
  1. Maybe try to re-seat (take out and put back in) the card. Is the video going through the onboard?
  2. Yes, the onboard always works. It's just that when I try to connect to my discrete there's nothing but a blank screen.
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