Dreamcast Problems

I have an early version DC - I got it when it first came out. It's in near-mint condition, and played great until about a couple of weeks ago. Sound only seems to come out of the right speaker. I used both the official DC s-video cable and a 3rd party one. Is there something wrong with my DC? I figure it has something to do with the port, but I'm not technically savvy. Any suggestions or questions would be great. Thanks!
Spray ALOT of rubbing alcohol into the connector then take the video cable and plug it in and out repeatedly. This should remove and oxidation you have on the connectors. The most likely cause of your problems.