Speakers not found

HI
i have a problem with my speakers i have a pavillon dv7 (laptop) with windows7 and the speakers just randomly stopped working for some programs: the youtube videos and skype does not have sound but when i use facebook sound is allright. this is kind weird because the computer is new bought it like 2 months ago.
please answer

Hey there,
Have you tried restarting the computer? Being that you can hear sound on other applications tells me that it is not a hardware issue. Can you also let me know the specific model of your DV7?
Thanks,
Sean S
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