Hi Rusty and thanks for your response again. Sorry for delays but I keep getting sidetracked to what other people regard as "more important" jobs !
I have opened up the unit and this is what happens when I power up:
1. Power up - display = please wait
display = HDDERR
Then the disk tray opens automatically.
2. Disk inserted, tray closed to play
I can hear disk unit trying to engage
display = LD FVU just for a second or so
then display = NG DISK alternating with NO FVU
3.After about 5 seconds the disk tray opens automatically again.
All the while this is happening I cannot detect any signs of heat or vibration from the hard drive unit.
4. I have disconnected the power supply to the drive and I get 24v across Red and black to the right of the plug (there are 4 wires, left to right yellow, black ,black, red).
I hope all this makes sense to you and I really appreciate your help
p.s. only just noticed the " EST " time zone !