No video with M3A78-CM

This is my first computer build and it's killing me. Anyhow, the one problem I have not been able to troubleshoot my way through is when I boot up my computer, all the fans start going and whatnot but I get no video and no beeps from the speaker (That is, if I plugged it in right) This is my first build so I'm clueless as to what to troubleshoot. I tried using my dedicated graphics card as the video source AND the dedicated on the MoBo. Please help!

M3A78-CM MoBo
AMD 7750 2.7GHz Black Edition
7900GS Nvidia Geforce
3gigs of RAM
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More about video m3a78
  1. It seems it didn't like where I plugged in the RAM, how strange.
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