Hi, i just assembled a B&W powermac g3. i have several pci graphic cards that i pulled from some old compaq PCs. after placing a graphic card into a pci slot, it would not display an image on my monitor. i have tried several different pci graphic cards. When i power up the computer. it does make the start up sound and the hard drive runs like the computer is booting but i get no image at all. Do i need to use a mac card? any help please. thanks.