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Hi FFighter, and welcome to the forum!
Whenever I hear of problems like this, my first thought goes to the cabling. If you use a mono plug anywhere in your cabling chain, you will get only the left. So first, check your cabling: every plug should be stereo, i.e. it should have a tip (left), a tiny little ring (right), and a sleeve (common ground).
Your onboard sound isn't a proper soundcard, rather the audio is software-generated, so any software glitch can cause problems like this. Other things you can try for this problem: Reboot. Reinstall the sound driver. Double-click the speaker icon in the systray and check the balance sliders.
Let us know if you find anything wrong with the cables.
-clintfan
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