Hi everyone.I'm using 15r 5521 laptop and I have a problem about sound .when I started my laptop , I don't see any problem.3-5 min. later I cannot hear any sound and I cannot speak with my mic.I tried to make system restore many times but then I received unknown error everytime when I restored.I tried to change my sound driver with dell's recommended driver but error received every time.Then I searched another solution in forums but I didn't find anything.
note:If I start any program about sound (ex.TS3/winamp/video games/etc) at startup , I have no problem about sound.