Sudden loss of signal/channels and reboots during GS

[tegandrew]

Hi all,

I've had a Tivo since June and it's been going splendidly until this morning.
All it would give me is the blue screen of no signal. I have checked the STB, cables, antenna etc and am sure that there is a signal entering the Tivo.
I can watch Now Playing shows but don't get Live TV and can't record.

I tried to fix it by rebooting to guided setup and re-doing my channels, but the Tivo reboots shortly after the first call, in one of the menus where I select my channel lineup (seems to be time-dependent rather than page-dependent).

edit:
And I've noticed a grey line at the top of the screen in the Tivo menus and while watching a recorded show - it's like the whole screen is shifted down a bit.

Thanks,
Andrew