Usually, when you cannot get a POST screen the mobo is history. Go ahead and pull all the plugs as stated below, but another, easier test would be to pull the RAM to see if the mobo beeps on startup(your manual will tell you the beep patterns for bad or missing components). If it won't beep with no RAM installed (or a bad or not completely seated video card), it is probably toast.  If I remember correctly you have replaced this mobo two or three times already.  Your power supply may be frying the EEPROM, or the board may be shorting out on the chassis.
>>(EDIT)
>>The machine worked fine for about a month.  It absolutely will not boot.
>>The case and CPU fans run, but there is not post performed.
>(EDIT)
>
>Mike-
>
>Remove all of the cards except the video card (which you have tested in
>another computer and is known good, right?), and pull the power and
>connecters to everything except the motherboard (the floppy, cdrom, HD and
>whatever else you might have in there like a Zip drive or whatever).
>
>Turn the machine on and see if it enters POST. If so, start adding things
>back in until you find the bad component. I've seen times when a faulty
>component with a motor (all of the drives) could load down the power supply
>to the point where the machine would not start.
>



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