PM G3 DT 266 Video problem

my pm g3 266 dt video went kaput. when i start my mac i get the bong
sound cd spins hd spins monitor comes on for a sec green then goes
amber and nothing happens. i removed every item removable from the
mobo, ram, battery, cache card, etc. even unplugged power supply and
still nothing. is it the adb monitor connection thats gone bad? i
havent done anything to the system, its been turned off for about 8
days. i just tried to power on yesterday and nothing. and i dont have
a mac pci video card to try with. if i was to get an older pci ati
video card would i be ok that way, cause i may get one instead of
changing the whole board out. any directions. thanks to all.