Help....when I turn my phone on the start up screen keeps repeating?

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http://forums.androidcentral.com – Yesterday my phone kept force closing my apps. This morning none of my apps wouldn't open so I restarted my phone. When the 4G screen comes up, it repeats the start up sound and it won't shut off. The only way I can turn it off is to remove the battery. I haven't dropped my phone, but I've been running out of space. Maybe that could have something to do with it? :-\ Help? I have a EVO 4G (HowTos)