Question Surround Sound Issue - My 5.1 sound system works but some speakers don't

[Enzy604]

Hello,

Writing on here in hopes for a solution.
I have an old school samsung 5.1 surround sound system. With speakers, subwoofer and a receiver. When I first hooked up the system everything was fine. Somehow now only the subwoofer, front left and right work.

Things I've tried:
- new digital input cable
- swapped speakers around and wiring
- used different inputs
- tried a different sound system
- switch power outlets

Still only the front left and right, subwoofers produce sound. I've tested rach speaker and they work.

Any suggestions?