Wont unlock (Black Screen)

carl3

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Aug 26, 2012
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Samsung Galaxy SII

After about 10 seconds after i lock the phone and try to unlock it, nothing happens. It stays black if i hold the Power button it restarts the phone. I have reformatted the SD Card and reset the phone. Still continues to do this. Every now and then it will reboot on its own after unlocking it.
 
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