Well hell, this sucks!... I guess this is what I get for trying something that wasnt meant to be. I ordered an Nvidia 5200 Ultra 64mb to use in my G4.. so I can use the new Dell 20" LCD that is suposed to be here tomorrow, I found a mod guide to allow it for use in the G4 AGP slots, well I did exactly as said, it looked just perfect, put it in the agp slot, fit just perfectly snug... plugged in my monitor. I plugged the powermac in, powered up... chime, waited for a signal to the monitor, then I hear.. hisss pop crackle... going through my head was "$h!t @H!TTTT!!!" Unplugged it right away, put my Nvidia Geforce2 MX back in the computer, powered up... Ding..... No signal, no signal.... no signal... holy crap I killed it. On the g3 powerbook sitting next to me I tried to access my website, which is on the powermac im pretty sure I just fried, My page loaded right up no problem. I think I literally killed my AGP slot, and I mean KILLED... My Geforce2 heatsink is a little hotter than usual... so something is very wrong, I have done what I could. I really dont see where anything is burned on my Logic board anywhere, no signs of any burned spots. I looked at the 5200 Ultra and seen no burn spots or any deformed capacitors or any thing. Now I'm out of money and need a new logic board, really really bad. Maybe someone on the board had a digital audio Powermac G4 they are throwing out... can I have the logic board?? I will pay for shipping!! lol, this sucks... Whatever you do, dont do that G5 to G4 Video card mod.