alright so we have two video cards not working now Im thinking drivers when was the last time you updated the videocard driver

and do you still have the floppy unpluged when you reboot I would leave it unplugged and have you tried putting in your repair disk in your cd-rom and then rebooting

tell me the steps you took here I just want to make sure you did this correctly.....no offense

check the proccessor. I had my PIII 450 do the same thing and come to find out the proccessor was just about out of the socket