All right, here is my deal. I have a Dual 1Ghz G4 Quicksilver that has a GeForce 4 Ti (4600), and the fan died on the card. So I went out and purchased a replacement fan for the card. Now, when I boot up the computer it will get through the kernel boot process and to the blue screen, but my login will never show up. Next I tried zapping the PRAM, then reseting Open firmware, these didn't work. So, I re-installed OS X (erase and install) and got through the install and the same thing happened. So then I ran Apple's Hardware Test and it passed just fine. I tried booting it off another disk. I tried booting it with different (tested) ram, none of these worked. So then I tried the card in another computer, same thing, stuck at the blue screen. Try another video card, the computer works fine. I guess, what I really want to know, is the video card fried or does someone have some cool fix out there? Let me know. Thanks!