I am a new member to this communty and i am proud to be one.I have been researching on this intel based mac for so long and i fianlly got it all waorking.the thing is that i want to upgrade my video card with a Palit 9400GT 512mb 128bit, but after installing iatkos 4i DVD all i get is a grey screen thats always telling me to restart and if i insert my old videocard, it will boot normally. I know u guys are the masters and talented enough and im asking for your help.waht should i do to make it work on my 9400GT?