There are too many long threads about this. I spent a week dealing with my 2 and this is what I learned. There are a few ways to fix a S03 error. But the best way is:
Step 1 - Unplug tuning adapter.
Step 2 - Put down remote and come back tomorrow.
Step 3 - Pick up remote, manual connect.
Step 4 - wait hours till it is done successfully.
Step 5 - Plug in tuning adapter.
delete stuff-reset stuff-clear stuff-reimage stuff- lose shows- get really angry.
Try method 1 first before moving on to method 2. I used method 1 on 1 of my machines and method 2 on the other, but I tried method 2 first.