Starting a few days ago my Mac froze mid usage, was using Chrome when it did it. I got all these crazy colors everywhere, and it froze. I turned off the power, waited a few, then turned back on.
It came up with some text telling me it didn't shut down correctly and hit Esc to reboot. I did, it showed that text again. So I turned off, took out the battery, waited 10 min.
After that, I turned back on and it came on and booted up. Again, I used it about 10 to 15 minutes and the colors went crazy again and it froze. Had to turn off again. I've done this a few times since then, trying to figure out what's wrong with it.
I booted into Mac+S console, ran
fsck and it said drive and files were good. I mounted the drive, all my files are there. So I exited console and rebooted.
At this point, I can't get past that text telling me to hit Esc to reboot.
It's a MacBook Pro (15-inch Early 2008) with Sierra.