radio quick working

hi guys.

i recently had new exterior and interior driver's side door handles installed in my 1995 318IS.

upon picking the car up, the radio doesn't work. the battery was disconnected (not sure why) so i typed in my five digit code as usual but still got nothing (i should mention that my LCD hasn't worked in awhile so i didn't know if it was even asking my for my code, i just assumed so and typed it in).

after this didn't work i checked the radio fuses (there are two of them). they looked fine but i changed them anyway and it still doesn't work.

any suggestions as to what my mechanic may have done or any other ideas as to why my radio decided to quit working?

thanks in advance!

jay