BleepingComputer.com: Problem with speakers

I've tried three different sets of speakers and everytime, my left speaker will not work. Also, I've plugged my headphones into the speakers and the left headphone doesn't work either.

I've checked all the volume controls and everything with that appears to be fine. Also, when I click the volume control on my desktop and check the volume, it beeps from my tower. And, I just unplugged the speakers a little from my computer and the left one started working, but not the right. When I plugged them fully in again, the left one stopped working once again.

I'd really like to find out how to fix this.

First try to reinstall the audio driver
It soundsl ike it could be the audio jacks or the controller itself
If this is a desktop, you could get a new sound card