Help with speakers

[JCDyer]

I got the Logitech z-560's hooked up to my system. I bought a nice set of sony headphones, not made in paticular for the computer, but I figured they would still work. Now I go to plug it in on the headphone jack and my speakers cut out, but no sound come in from the headphones. I also get no sound from the headphones when I plug them into EITHER headphone jack on my dvd player and cd burner. The last was also tried on my dads computer with the same result. When I hook them up to my stereo they work fine. Am I missing something here? Appreciate any help.

[JCDyer]

Pushed in completely and volume on the speakers and sound card was ajusted with no change. Not sure how to check the midi adapter.

[spigidygak]

What headphones are they? If they are really nice. . . they may need more power and your computer ports probably don't push enough juice to power them. You might have to get a headphone amp. However being Sony's. . . I doubt they would need an amp. Do you have to use a mini-adapter to plug them in? If so that could be your problem the adapter plug may be bad.

[G_Sup]

If you have an Audigy or SBLive make sure you go into the audio properties and select headphones.