The issue is carefully investigating the system to see if you can locate what you bumped. take the hard drive out, with the power off and retrace the possible trajectory of the hard drive as you moved it. If you broke or bent a capacitor on the Mobo then a replacement is in order.
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.