no sound from my headphones

[Guest]

Hi

I'm using windows vista..the headphones have been working fine up until this
week. Now when I plug them in, not sound comes out of the headphones, just
the pc. What can I so that sounds automatically comes out of the headphones
when I plug them in?

 

[Robert Martin]

Do they work on other devices?

 

[Guest]

yes.. the headphones work on other things..I've tried several pairs of
headphones, none work..it's as if the pc doesn't realise that they've been
plugged in.