[Q] Dropped phone from sofa to wood floor = screen fades very quick...

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http://forum.xda-developers.com – Hi Got my S3 the other day.. Worked fine.. Now it have been dropped from the sofa and down on a wood floor.. Now the screen fades very quick, impossible to type sim code etc... Even when it boot up and I try to go into download mode the screen fades... What to do? If I want to send it back to the store I have to get it back to stock ROM. At this moment I run CM10 on it. Where can I find that ROM? (HowTos)