Onboard video problems

I recently purchased a new system with a ASRock A780GMH mobo and I'm currently getting no onboard video response, it's just a black screen saying check signal. I've tried both DVI and VGA outputs to no success. I'm using a 21.5" Samsung LCD and it works fine on this computer. My specs are as follows:

AMD Phenom II X4 940 Deneb 3.0GHz
ASRock A780GMH
Antec EA650 650W PS

Any suggestions/tips on what I should do to get this thing up and running?
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More about onboard video problems
  1. Clear the bios and try again.
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