One channel onboard sound?

[Supra]

I recently purchased a new MSI K7T Turbo motherboard for a pc for my younger siblings. I set it up with Win98SE(fully updated) and got all the latest drivers from MSI website . When I went to use anything with audio only the left channel puts out sound. I know the speakers are good and ive made sure the their plugged in all the way. All audio sliders are in the middle in the volume control menu. There is a BIOS update but ive never heard of an audio problem being fixed by a BIOS update. I'm thinking the actual sound hardware is bad and if thats the case I might RMA the board if I cant find a cheap sound card for less than $10

System specs:
Duron 750
MSI K7T Turbo
196MB RAM(3 64MB simms)
Creative FireGL 1000 Pro
AC'97 onboard sound

 

[vegasgmc]

One of the contacts in the audio jack might not be making contact with the plug.