Both controller ports are not working
I purchased a complete in box non dual shock PlayStation at a flea market. It loads games fine but both controller ports are not working. When I plug in a dual shock controller, the analog light will not go on. I don't know if the memory card ports work as I can't access the memory card screen.
The console itself it spotless, no rust at all. I've tried removing the controller port ribbon cable and examining components but everything seems fine.
Note: The original controller it included has a broken cable where someone had twisted each wire together and covered them with electrical tape. I haven't messed it with it yet, but it doesn't work on a PS1 I have. I include this info in case it may have caused the problem.
Could a bad controller have blown the port? How would I troubleshoot this? Any point I can test with my fluke meter that would help to troubleshoot the issue?