Cannot get the radio to work?

Recently took my 53 Corsa to have a new 'squib' fitted and since then the radio doesn't work.
The display lights up. Have tried to reinsert the code but am unable to turn radio on or off using the volume control button. Do I have to replace another fuse on the radio (my son and I sucsefully did this last year with the help from this site ) or does it need to go back to the garage.

Shelagh
November 2010