when you plug the usb cable into the motherboard, is the connector keyed to make sure it can go in only one way? If its not, try flipping the connector 180 degrees.
evga 8800gt dual-slot cooler
4gig (2x2gb)g.skill ddr2 1066
Antec sonata II mid tower
200gb Seagate HDD, 500gb Seagate HDD, 1TB Seagate HDD