No. of Recommendations: 0
It sounds like you took the right steps, and if you are sure that all of the cables are connected properly then it is possible that the receiver did get goofed up. Having (screwed-up) sound coming out of the speakers is probably a worse sign than no sound at all.

Just so I got this right: It sounds right in stereo mode (L/R speakers), but ALL of the speakers are distorted in Pro-logic mode.

Was everything turned off and unplugged when you disconnected/re-connected? If not, you might have caused a short.

Some Pro-logic receivers use a single "channel" of the amp for the center and surround speakers. If that channel goes out then it will affect those three speakers. But, that wouldn't explain why the main speakers are only messing up in Pro-logic mode.

Sounds like it might be time to upgrade to Dolby Digital/DTS.

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