Seems when i reconnected my eurovox headunit the security code no longer comes up and the headunit wont turn on or off. There is power too it, time shows up :S

everything for the loom seems fine apart from a yellow and black cable which arent connected to anything?
All the speakers are running off aftermarket wiring except the rear door speakers so they should work if i can turn the headunit on.

i just got the car and the previous dude took his amp and headunit out, he doesnt hav a clue why it aint working either.