HT201412 my iphone 4s does not start by power switch, it starts when i connect to pc. the proximity sensor is not working. please help

my iphone 4s does not start by power switch, it starts when i connect to pc. the proximity sensor is not working. please help.

Sounds like it may be a hardware issue.
Please contact Apple Support in your country.
Here is a list of numbers: http://support.apple.com/kb/HE57
Regards
J

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