Is that on a Socket 939 or another type board? On the S939s you need to plug a four wire plug in near the cpu socket to supply power to the video card(s) and many systems wil fail to boot if that is not in. The PCI-Express cards are no longer powered indirectly through the board even though that power travels a pipeway to the card PCI-E slot(s).
If you plugged in a 20pin/4pin type connector into a 24pin power socket on the board you usually won't see much. Another to check is all power connections along with the harness for the case itself for the power, reset, leds, audio feeds that plug into the small blocks of several pins on the board. You have to review the user's manual's diagram and verify those are not mislocated or reversed.
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