disc changer stopped working!?

[Dean]

my mate took the battery out of my car to try on his to see if his was nackered!

since putting it back on my car, my disc changer doesnt seem to work, so i had a look at it and the doesnt seem to any power to it, as it wont release the discs that are in!

does anyone have any idea what could be?

the headunit still works fine.

 

[ChrisLu]

look at the fuse's

 

[Dean]

where would the fuse be tho mate?

with the headunit still working? will it be on the changer its self!?