With my original Tivo dead,I have picked up another unit and performed the chip mod.
I put my original (modified) drive in and Tivo boots up but I have a message
"A hardware problem has been detected which needs your attention.Until this problem is fixed,you will not be able to record programs or watch recordings.You will need to restart the Tivo Media Device now.If you see this message again even after the Media Device..."

I restarted several times.
Do I need to do a "Clear and Delete Everything"?

It let me do a guided setup which didn't fix the problem.
Thanks