WTF -really need help!!! Green Man

thanks a lot... I did just another power off and on and am ok, but I know that this will probably happen again if I don't solve the problem.

BTW, what exactly was that screen I got??? was it a reset screen or something? I couldn't make heads or tails of it, because I had a "downloading" thing, a do not cut power message, and an arrow that said "START"...

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