I got a problem with Galaxy S super amoled buttons

Hi all,
I bought Galaxy S super amoled 2 days ago and yesturday my friend took it for just 1 min afterthat The Home, Search, Back and Menu buttons don't work till now.

please tell me how to fix this problem?

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Have you tried rebooting the phone? Take the battery, out and put it back in, turn the phone back on.

I did it but it doesn't work also.
Do you have another solution?

Did you buy the phone new? I would take it back if so.