I removed all but one of the original RAM sticks (the 256MB PC133 stick in the 1st slot) and it finally displayed video and booted up. It would seem that one of the original sticks or one of the slots are bad. However, prior to removing them the first time, all the slots were occupied and all of the sticks in each slot were recognized. I wasn't able to reseat the video card or remove the PCI cards because the screws won't budge, a problem I have all the time. Attempting to reset the PRAM didn't seem to work, even though I was using an Apple USB keyboard.