Might be an issue with some sort of software that's keeping it in a loop?
You could try turning it on in safe-mode. Each phone has it's own way of initiating this. This link is for a samsung galaxy ace I. It might be the same for a ace II.
http://forum.xda-developers.com/showthre...
Once you're in safe mode, I'd try to clear out any apps you think could be causing an issue (any apps downloaded right before this happened, app that has crashed a lot before, etc)
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