Stereo Problem

[Kid_Random]

Hey Guys

A mate of mine today tried to take out the car kit from his car.

When he was taking it out he cut a wire. Now his stereo (stock au falcon premium sound with stacker under seat) wont let you listen to anymusic or anything, the unit just says "TEL" on it

Anyone have any idea how to fix it?

My guess is there is an extra cord plugged into the back of the stereo just thort id get your guys opinion!