OK, 3 days ago I changed the USB cable- All 3 EHDs are being recognized now. It's the 1st time I replaced the USB cab.- The 722 has 1 USB port. I would not have guessed that a metal end on a cable that still fits tight could go bad. One question- If I leave an EHD plugged in @ nightime does the HD go into sleep mode when the 722 is off? It blinks during the night if plugged in. Problem is gone! Thanks all for your help.
The 722 is never off. The front lights & output just don't do anything. It goes to the screen saver for output.