Why won't my speakers work?

Why wont my speakers work on my computer?

• I have logitech speakers, they were working ok accept one, and my friend was getting rid of some of his speakers so i switched his ones for mine, which I decided the sound wasn't clear enough, so I switched it back around to my logitech ones, they now don't work. What I mean by don't work is that it will only work when I try test them using the on screen sound tester, but when ever I try play a file that has sound, whether its you tube or I-tunes, it doesn't play any sound. I have checked the mixer and it is all checked to be OK, why is this? (I have windows vista if that helps.)

• Answer:

  Don't know of any speakers that come with drivers. Speakers are plug and play. You might want to look into your sound card since you seem to have proved that the speakers themselves work