I have a G4 PowerPC MDD 1.25Ghz mac, and recently upgraded to a used G5 PowerPC 2Ghz DP (M9032LL/A). The older G4, I had installed a 9800Pro 128MB video card, so... was going to swap cards with the G5 and its 9600Pro 64MB card. Sadly, despite having done hundreds of PC upgrades over the years, I somehow managed to kill the 9800Pro, just getting a checker board pattern on the screen where every other square is gibberish. So, looks like I now have to buy a new card... debating the 9800Pro 256MB or the nVidia 7800GS 256MB. Anyway... if anyone has any comments on how to fix the 9800Pro I am all ears. Aside from that... I went to shove the 9600Pro into the G4 and nothing. Won't even try to turn on at all. Works fine back in the G5 though. Both AGP, and I see many listings for the 9800Pro guranteed to work in the G5 even though the size of the cards connector is different... just confused why the 9600 fails to work on the G4. Also worried I'll buy a 9600 for the G4 and have the same issue. I want to sell the G4 so needs a card if the 9600 I have fails to work. :S Anyone know why it fails to work? anything I need to look for on eBay? I understand there is the AGP 2x, 4x and 8x... is that the reason? 8x in a 2x slot?