Hi Pete,

Thanks for your reply.

I thankfully kept the original hdd from when I upgraded to a 750GB all those years ago. With nothing to lose, I reinstalled the original 160GB and after a few minutes I have a functioning TiVo once again.

I can only guess that after 4 years of constant use, the Samsung 750GB green HDD has started to collect a few bad blocks.

I am (fingers crossed) hoping that Hybrid haven't started to lock-out modified TiVos, as I will purchase a new hdd this week.

So apart from losing my recordings, I am a happy man.

Cheers,

Rstoms