radio doesn't turn on/off with ignition

Please help,

The standard radio in my 200 doesn't turn ON and OFF when I turn the ignition on. I heard it could be a fuse or perhaps a lose wire behind the stereo..

Any Ideas? THANKS
 
That seems really odd as it should be wired to the ignition live.

Does it turn off if you turn the engine off, pull the key and open the door? My stereo never turns itself off until i open the door.
 
thanks guys,

Sorted it in the end... was confusing myself with plugging an ipod in.. had to manually start my ipod everytime.. radio appears fine..