My understanding is that if you lose power to the DVR, it will not go past the satellite error message if it can't find a signal. Heed the warning up thread to keep the DVR on UPS if you are disconnecting the satellite!
Unless they have changed it in the last 3-4 week, that is not the case.
Test it out yourself. Simply disconnect the RG6 and reboot. It will error out (Communication Problem with Satellite - 775). Will continue to try and reboot if you leave it there long enough. But hit menu (you will see 775 cabling problem in PIG). Press startup menu and move to Playlist. It will allow you to play programs off the hard drive.
It will not try a reboot loop when you are in the Startup Menu.
Agree that UPS is best, but it wasn't an issue in late April. UPS would also prevent any Whole Home Authorization issues upon reboot with no signal.
EDIT: I just tried this again with a HR20 and the above comments are correct - at least with a HR20. Have not attempted with a Genie.
Edited by SomeRandomIdiot, 19 May 2013 - 07:42 PM.