Iphone 4 won't turn on

screen is black
doesn't charge. holding power+home for 10,20,30 secs doesn't help
can not enter recovery mode or DFU mode. not recognized by macs\PCs.
was running ios 5.0.1. when suddenly turned off.
please help... i am desperate.

Hmmm......I can't guide you through these next two suggestions, but:
1. Go to the Apple Site and download the ownersmanual. Follow the procedure for DFU mode
OR
2. Go to Google and Google Recboot. Download the software and try that.
If neither solution works for you, you may need to schedule an appointment at your local Apple Store Genius Bar and let them run diagnostics. If they find the phone is defective, they'll replace it.
Good luck and I hope you get your phone back up and running......

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