|If you installed the sound card's software correctly by using it's installation progam, and NOT by loading sound drivers while booting BEFORE that was loaded, which is the wrong way...|
- this is probably in the manual for your sound card - have you read it? That's probably on the CD that came with it, if it wasn't automatically installed in Windows - there is a settings program somewhere that you can use when you connect more than a single pair of speakers - it's usually in Control Panel somewhere, and/or if might be in your Programs list somewhere. You set that up to assign the non default uses for the ports you plugged the speakers into
- the volume for the two speakers you're not hearing may have their volume set too low. RIGHT click on the speaker icon in your taskbar lower right, choose Open Volume Control.
If not all the speakers are listed, click on Options upper left, Properties, click on the blank boxes to insert a checkmark on everything you want the volumes to appear for.
(the mic volume is muted by default - that's normal)