Display Iphone 3G doesn't turn off

Help me, When I lift my iPhone to my ear, the proximity sensor doesn't turns off the display to prevent inadvertent touches. The software is 2.2.1.

When I call, the screen doesn.t shut off and I don't use the cover. I tried to cover the sensor during the a call but the screen dosen't shut off. Someone know the method or the software to check IPHONE Hardware?

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    My iPhone 3G 16gb in white: I did all the things you mentioned, but it just keep looping the Apple logo and doesn't turn off until it is out of battery, and I am using a MacBook Pro 15inch Unibody if that does matter

    If you are in Hong Kong, go to Digital Trade, 1/F, Sincere Plaza, Argyle Street, and it will cost you 120-150HKD, but before you go check that your power button and home button are working correctly, if not press as hard as you can, hope this will help.

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    http://support.apple.com/kb/HT1430
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