I had to get my son a glass of water around 4 this morning. As I'm walking throught the living room to the bedroom I notice that the fan on my 722 is on and working as if the 722 is on fire. Then all the lights on the front of the panel come on for a few seconds. Then the fan dies down. The whole time this was happening though, the receiver was cool to the touch. So I turn on the tv and 722 and after a few moments it comes on and I get the Acquiring signal picture on the screen as if the receiver resetted itself. So later this morning I go into the Diagnostics section and under Counters I see, 07) Fsck:1:5-30-08-4:00 AM. So I'm guessing this Fsck is what was going on but what does it stand for? Is it good or bad and what makes it happen, should I worry. Thanks.