Had a dead HS in my 540040.... behold the power of IC!
Got it up and running again, on a new 120gb HD.... WOO!
After upgrading my 540040 to the 120 gb drive with IC, whenever I go to the Settings menu, and select "Channels", the Tivo reboots itself.
I can do everything else, but I can't set up my channels (so obviously, I can't do much).