Boot Problem: Hard Disk not found

My friend has a dell optiplex gx240. He brought it over because he somehow managed to get 2 opperating systems installed on the same drive and it was causing him alot of problems. I completle wiped the hard drive and reinstalled windows. Now when the computer boots up it beeps twice and i get an error message that says:

"Primary hard disk drive 1 not found"
"Strike F1 to continue, F2 to run the setup utility"

If I press F1 the computer boots up as it normally would right to windows, its just really annoying that it comes up EVERY time I start the computer.

I have tried changing the jummper settings, tried switching the plugs so it was in differnt spots on the harness... there is one hard drive, 2 cd-rom drives and a floppy drive installed on the computer. The 2 cd rom drives are hooked up on the same cable. The floppy drive has its own cable, as does the hard drive. Any and all help would be greatly appreciated!