dead radio :(

[Karim E36]

I have a problem with my stock radio. It's completely dead. Doesn't turn on, no lights, nothing. Not even the antitheft light.

I checked the fuses. They're ok. I swapped my radio for another working one. Still not working, so it's not the radio.

What can it be? What should I check next?

Thanks.

Karim.

[driveway]

I need a code for one if you know of a factory code please pm me