CPU overclock problem

Hi everybody, I overclock my amd phenom x4 II 955 BE to 3.8 Ghz, my motherboard is ECS gf8200a Black edition, I upgrade the bios, when I press the power button everything get on, but the windows don't work, only the black screen on the monitor, then I press the reset button and the windows work, the pc work great ( play games, benchmarks,...) the only problem is when I press the power button, I don´t know what is the problem
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  1. My power supply is a cooler master extreme power plus 600 watt, my video card is his 5850 1 gb
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