Lenovo u400 speakers not working

my Lenovo u400 built-in speakers worked when I first got it, but after about two weeks, they didn't work. I have tried reinstalling the driver,(but every time it automatically installs after rebooting-could that be the problem?), still no luck. In the SRS Premium Sound panel, I can click on speaker and headphones, but I cannot select built-in speakers.could it be a hardware malfunction? loose connection?
Pleasehelp - thankyou

Hey everyone,
I had the same problem. I had inserted the headphone into the jackpot several times and after 30 sec or so, speakers came back to life . I think this somehow related to the jackpot malfunctioning. Try it if you're running to the same problem!
cheers
hadi

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