headunit problems

[luke rn club med]

fitted a new cd headunit and it worked ok for 5 days but then after taking it out and puting it back in it stoped working it would power up when i put a cd in but then turn stright of so took it back to the place i bought it from they tested it and it worked fine in store
so im thinkin it must be one of the wires as i can get a tape headunit to run so does anyone know what all the wires are for

 

[msa197]

Try it with the headunit out of the dash!

 

[Matty Baby]

will be knocking around in your car you probably havent secured it properly or used the little stopper at the back and so the wires are popping out. In answer to your question, the block of wires are you power, the other that u have to like bend on left of back is aerial and other two are your cd changer and dash screen thing.