W211 Comand shutting down

We have 2005 E55 Wagon. The Comand (radio) will start up, show the logo, and shut right down. No error message. You can turn it on and it will do it again. Over and over.
Any thoughts? We're going to sell the car and would like it to work.
Thanks!
Tom

This is a well know problem.
You can try a AGW reset by removing the F6 Fuse (The fuse box is located on the left side of the trunk). When removed, wait 10 Minutes and reinstal the fuse...


