|If these are internal SATA drives, try unplugging and replugging SATA and power connectors. If that does not make a difference, try different power connectors from the power supply and new SATA signal wires. Try different SATA ports. WARNING: Ground yourself on the computer case first, then unplug the power cord.|
Check in Disk Manager to see what it reports on the drives. If they are seen there then tell us exactly what it says there. If after all that, if the drives do not show at all in Disk Manager, the drives are probably bad but you can try them on another computer to be sure.
You have to be a little bit crazy to keep you from going insane.