So, I tried the HD LED on the only unused jumper, which is J1, and no go. It caused the machine not to boot. I have searched both sides of the board, and couldn't find anywhere to hook up the LED. The only other jumper is J2, which is the autoboot enable. So I still have the LED on the front of my SCSI card reader, so it isn't like I don't have a HD LED. I put the machine back together, and it works great. Thanks.