Please Help, Xbox DVD locked up, No audio or Video... Options

[Mexpac]

I had my Xbox on the trunk of my car, It was really cold outside (Like -15 C) and I tried to plug in my Xbox.

Now the led flashes 3 times and then go into the red/green state, and there is nothing on the screen, not even the starting flubber. The audio/video cable is not it because if I unpluged it, it gives me the Orange led display.

I tried disconecting everithing And Its alwais the same problem (and now the Xbow is no longer frozen).

I even got the green flubber before when I was installing my modchip and nothing else was hooked up on my Xbox at that time (Hard Disk and DVD unpluged and no mod chip yet)

I want to know if someone had similar problems, If the mother board it is F**** Up because of the cold temperature, what components do I have to check and how can I test them.

This is what I have :
Xbox V1.0
Unlocked 120 Maxtor HD
Thompsom Drive
Matrix Modchip 4977 Bios

Thank you.