Does the display light up when you switch it on?
If so , what does it say?
If not, then it is likely that there is no power to the radio , either a blown fuse or poor/connection somewhere.
(Might be worth pushing the radio front hard to make sure that it hasn`t come loose )
If you have / can use a multi-meter or test lamp, then the radio can be removed and the wiring can be checked.
If not , then you`ll have to take it in for repair.
RegWorts, July 2008