Had a similar issue with my 2001 LS430----radio did not power up. Dealer quoted me something like $800 to replace the radio. I declined the service. Later, my CD player also stopped working. Later again, I needed to replace my car battery, which was an Interstate. When I did, the radio and CD player popped right on, which surprised the heck out of me. I informed the service rep at the Dealer who was dumb founded. So, everything was fixed for the $150 price of a new battery.