Headphones don't work

[Tunni]

Well, this happened before. I'm not sure, but it might be a virus related problem.
Whenever I plug my headphones in (yes, I plug them into the correct socket, the green one) it shows me that it is plugged in but I can't hear anything! Otherwise, they work.
What shall I do?

[Calum]

Do other headphones or speakers work from the green socket?  Is this a front or rear port?

[Tunni]

Yes, only one does, but the other ones don't.

[Calum]

OK, so the socket does work with another set of headphones?  Is this a front or rear port?