Headphones don't work.?

I plug my receiver into the headphones output and i can hear nought. It used to work just a couple of days ago. Plz Help, is in attendance a way where on earth i can test the receiver or anything?
I have a HP Pavilion dv9000t

Answer:
once u put your headset to your T.V, then u can in a minute its working or not

Check the "Windows" properties and see if that "Port" is muted.
Test them on any other audio device.

tryin to use em kind of is testin em?? go and get new ones.

verify that your nouns is turned up in window and on the headphones.

You can testing the hardware in Control Panel / Sounds

budge get a current pair

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Headphones don't work.?

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