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My motherboard platform is ATX(20pin)+I7-620LE+QM57+Winbond 83627UHG.
I can't power off motherboard by power button in DOS and WINDOWS.
The power button is as same as reset button, system will cold reset when push a power button.
system also reset when select windows ->startup->shutdown.
system will reset even I use DOS utility to clean all PM1_EN and GPE0_EN then set PM1_CNT=3C00h for softoff.