I have had this dvr for two months. I just went blank. I unplugged and replugged. It gave me the following: E609 - Front - then went to a "dl" with a cursor spinning for some time and then rebooted about 20 minutes later and then went back to the dl with the cursor spinning.
Comcast had no clue what it is. They suggested letting it sit for an hour. If no luck, call them for a replacement. Anyone with a clue?