No post, No video

Prior system went bad, Upgraded to a NEW Msi P7n-SLI MOBO w/ Intel 6750 Core two duo CPU. Corsair dominator 4gb. New 850w psu. Two Nvidia 9500gt Sli video cards from prior system. Problem system will not post, no beeps, no video on screen. Have checked all connections, have tried out of case boot and still nothing. Can the video cards keep it from booting
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More about post video
  1. A faulty or incorrectly installed part can prevent POSTing. Double-check your connections. Clear cmos. It's in the mobo manual.
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