@dannyp1
Have you tried using HDToolbox to see if the drives are recognized at all? Otherwise check the bus for termination and termpower (pin 26 on internal 50 pin or pin 25 external).
@orb85750
That's probably one of the sensors of the drive. They're visible when looking into the disk slot - two on the left and one on the right side (for HD drives). Carefully push the inner one on the left side several times with a flat screwdriver all the way, that might clear the contacts.
(The outer sensor is for write protect and the right one for high density/half RPM.)
