I have a DH55TC on my work machine with an Intel Core i3-530 and 4GB 1066 in two channels. Within the last month, when I perform a restart/shutdown from either the OS or bios, the system just sits there after the video stops with the fans still running. I have to hold the power button down to have it power off and then power it back on. I've attempted new memory, cpu, hdd, psu, and gpu card. The only thing I can imagine it being is the motherboard. I've upated the bios to version 0046 released on 04/22/2011 but that didn't reslove it. Anyone else have this problem or know what it could be that might be causing it?