Hello, On my old powermac g4 I attempted to install Ubuntu Linux on it. Once the installation finish I rebooted the computer. everything seemed to be fine, it was booting properly. then the screen just went black and stayed that way. I did a little research and I figured out that it was probably my graphic card was incompatible with the operating system I installed. I have no idea what graphic card I current have installed in it, but I was wondering if anyone knew where I could get a graphic card that will be compatible with Linux operating system (for a decent price, I might add)? By the way, after the Linux installation didn't work, I reinstalled OS X and it worked perfectly fine so this is what led me to believe it was the graphic card.