Suggest disconnecting from the car for 10 mins(either by removing fuse or battery connection) ..then reconnect .
Make sure you have the Radio Security Keycode before you start.
Ask a NEW question here if you don`t have the code quoting the Serial Number beginning with M++++++ found on the radio casing
Removal instructions here www.tinyurl.com/4ydhop
RegWorts
September 2008