My Mac Pro screen is now a negative image and I'm not sure how to get it back to normal.
I know my son uploaded "Steam" and "Portal" onto this computer (big mistake). I removed them, emptied the trash and restarted the machine a few times.
The screen is still negative, like an x-ray!!
Can somebody out there point the way to getting my screen back to normal. Nothing I've tried in prefs or utilities seems to get it back.
Help!