Who knows...

Got a pre-POST hang at 2.4GHz @ 533MHz FSB... Seeing as how the CPU, RAM, and HDD all pass numerous diagnostics with flying colours, swapping video cards and CMOS batteries made no difference, two clean installations of two different versions of Windows solved nothing, and there were months of flawless operation with the exact same configuration for months before this all started, I'm beginning to suspect the PSU... Guh... I'm just gonna put up with the sketchy startup until something dies :\