What model Tivo? Some models are starting to show signs of capacitor plague with the power supply.
Most likely the hard drive has died, but the power supply could also be suspect.
How do you feel about attempting the repair yourself?
Only basic skills are needed to "eyeball" the power suppy or change out the hard drive.
Edit: I forgot I was in the Premiere forum, so the power supply is less suspect.
Have you tried any of the kickstart codes?