deck has power but no illumination

Hello,

While installing a deck everything started up fine, but when the XM cable thing hit the ash tray metal it made a spark. The deck is still getting power, as the little power button still lights up, but nothing shows up on the face and none of the other functions work. I checked the fuse in the deck and its fine, I also changed it just in case, and still have the same problem?

Any Idea whats wrong?

I have found a guy that has the same problem as me, and some said to connect the Red wire to the Yellow, and it should work, but your setting will reset everytime. Does that work? if so do you connect the Y and R wire on the stereo deck plug? or mach the Y deck plug with the R wire from the car and vise versa?

Thanks

Im not sure if im getting constant voltage, my voltmeter seems to be not working. So I connect the yellow and red wire on the harness together? than connect that to something? or just connect the Yellow and red wires on the harness

Oh so, I connect the yellow and red of the radio and connect the red of the car to the already connected yellow and red radio wire?

What if that doesnt work? and my friend hit the yellow car wire on the metal deck and sparked, now there is no power going to it? (This is all for my friend, but now its the exact same as mines) has no power going to it. But we checked every single fuse. and they all seemed fine?

we're both kind of poor to go to a professional.