HT1688 my iphone 4 wont powerup completely, WON'T TURN ON ALL THE WAY!!

my iphone 4 wont do anything, all it will do is stay black except the apple icon appears in the middle of screen when i try powering it on, but then it just stays that way.  or i can power it off and then it is just a completely black screen. 
please help

You can try resetting it (by holding the on/off and home buttons at the same time until you see the Apple logo - ignoring the off slider that appears first - then releasing), but I doubt that will work.  If it is continuously showing the Apple logo, you'll probably have to force it into recovery mode to restore it.  See http://support.apple.com/kb/ht1808.

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