So I just got my Radeon 9800 in, set it all up (my power extender was quite fragile so I just went directly from the PSU and stock plug to the card., put it in my G4, works perfectly. Then, I want to make sure all is alright since the original plug sits in a little higher since theirs wires coming under it, not into it (if you get what I'm saying) make sure all is good, pull the card out, put it back in re connect the power.. and my Mac boots to the grey screen and then the blue but I get no "Starting Mac OS X" screen. reset my PRAM / NVRAM, still nothing boot from CD, run disk utility, both drives are fine put stock card in, boots fine, put 9800 get the blue screen once more. So I am stumped, could the card have went from good to bad THAT fast? I 'discharged' my self of static , so I doubt that i killed the card. Any advice? I've been trying everything I can think of.... Edit: now seems that the stock card isn't booting either..