G3 Beige no graphic output?



hia i have a g3 beige OS9.2.2 that i think has no graphic output.
i know its not the monitor as i have tested it on another machine.
ive tried replacing the PRAM battery.How do i replace the built in card or do i need a PCI one.Prior to this happening the display would set to 640x780? when i used to have it set at 1024x768..any help would be appreciated

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