OK. I upgraded to 1.2.21 and now after leaving it plugged in for hours it just cycles on and off. Reading the very nice FAQ I see I can:
When the unit boots up, the instant Welcome appears, press and hold Menu and Format simultaneously. Keep holding until the display says Repair?. Release both keys.
Then press and hold one of the following keys:
* Format to get Clear NVM? (NVM = non-volatile memory)
* Select to get Zero HDD? (resets CPRM code? does not appear to modify the disk itself)
* Exit to get Wipe Unit? (performs both a Clear NVM and Zero HDD in one operation)
Release the key.
This sounds pretty risky and I would like to hear from someone who has tried this with success.