I have an older, 2007 15-inch MacBook Pro (model identifier
MacBookPro3,1) which has begun freezing repeatedly.
If I boot into Single User Mode it stays operative, however I've begun to get graphic glitches here too:
Booting to the Mountain Lion recovery partition, a disc, or any other graphic interface I get a freezing hang. This is often before the machine has booted completely.
At other times it will repeatedly reboot.
I have reset SMC and PRAM, and run
fsck -fy on the drive.
I should also note that the machine generally kicks up its fan pretty quickly and runs very hot, even in Single User Mode, so I am suspecting overheating, perhaps brought on by the video demands?
Does anyone else have a guess at this and/or another diagnostic step?