Black screen but download comes

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http://forum.xda-developers.com – Hello all, My friend dropped his ace recently and the screen blacks out occasionally, and his phone app started crashing. So i put it into download mode and flashed a stock gingerbread rom. When i access download mode it shows on the screen, but stock recovery doesn't come up, just a black screen. And when i start it up i can't tell if it's stuck in a boot loop or its started up, and the battery gets hot. Can anyone help me out? Thanks Sent from my GT-I9300 using xda app-developers app (HowTos)