Why is my radio not getting any power? on 1999 Mitsubishi Montero Sport

I tried unsuccessfully to enter a code in it after it got locked. The screen went blank. I tried to replace the radio but the new one gets no power either.

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 1 comment
Fuse or harness problem. Check ALL fuses! More than one source for radios!
Thanks