So it's not enough I had to replace the midplane, now the screen keeps dimming after a bit, as though it's saving power (which it isn't set to do anywhere that I can find?), if I move the mouse the brightness comes back up and all is normal...for a few seconds, then it goes back down in brightness again (actually it's darker at the top than at the bottom at this point, like a gradient). Now it just stays like it and other than rebooting there is nothing I can do to get it back to normal. What gives? It wasn't doing this before the midplane was replaced, but by the same token since the midplane was replaced it has been fine too (replaced it a few days back), it is only today it has started doing this. Yup, I've zapped the PRAM I will call Apple about it on Monday, but I thought I'd ask just incase anyone had any ideas Thanks.