As for 10.4.4 I’m stuck at the grey screen even after following dosdude’s terminal commands for Single User Mode. When I exit the Single User Mode it’s not booting to desktop to let me install the graphics acceleration patch I downloaded.
You followed correct procedure here, but I guess your iMac7,1 does have instead an ATI GPU so you should remove before applying the 10.14.4accel patch some kind of these:
rm -R /System/Library/Extensions/ATI*.kext
or
rm -R /System/Library/Extensions/AMD*.kext
but if I am right you should remove only this one to allow GUI booting so try only remove this:
rm -R /System/Library/Extensions/AMDRadeonX3000.kext
if still can't boot maybe these too needed to be removed but I am not really sure of them:
AMD2400Controller.kext
AMD2600Controller.kext
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iMac 12,2 Users can't upgrade to Mojave? I know it's a non-metal supported GPU but I've seen HD4000 series boot it so how come the HD5000/6000 can't? Just an honest question if somebody could give me a reply & and I hope somebody finds a fix for it soon, I don't want to give up hope as I'm seeing late 2008's taking Mojave