I've reset a 7941 because it was stuck at 'registering' (using #123456789*0#)
Its now cycling through and not booting up. The two lines buttons light up one after another, then it just resets and does the same thing again; it never tries to boot.
This has happened to 2 handsets.
(Incidentally im trying to connect them to my 2801 CCME, they used to be connected to my old UC520)
The 7941 that came with the system works fine.