I dropped my iPhone earlier this evening and the screen went blank. About 10 minutes later it came back on to the homescreen, so I thought everything was ok again.

I've now noticed that if I press the sleep button the screen goes blank again, but if I turn it off and back on again it comes on. Only problem is, I can't let it go to sleep or the same thing happens again.

Any help or advice as to anything I can do? (I know it doesn't help that irs been dropped )

Apple Genius bar and try get a swap out.