I went to watch a show on my Series 2 (upgraded to 220hrs) Tivo last night and when I turned on the TV it said "Powering up please wait" it then got to the almost there screen, then flickered and went blank and then back to the "powering up..." screen

. Turned off power by unplugging the power cord and plugging it back in, still no go.
I ran diagnostics on the original drive A (40GB) and it came back as it was bad. The upgrade drive (Drive B, 160GB) is in good shape. It is OK if I lose the recordings on the drive.
What do I need to do to either:
1) Replace Drive A with Drive B and make it only a single drive 160GB Tivo
or
2) Replace Drive A with a new drive and keep Drive B as Drive B
I would prefer to do option 1 as I would not need to get a new HDD right away.
I have another Tivo that I might be able to get an image from. It is also a 2 drive upgraded Tivo.
Any suggestions?
Thanks,
Andy