crwdns2933423:0crwdne2933423:0
crwdns2918538:0crwdne2918538:0

crwdns2934241:0crwdne2934241:0 mrbarbarito

crwdns2934249:0crwdne2934249:0:

Had that problem with my 2011 iMac.  Took it to a Mac repair shop; they installed a new video card (or something to that effect).  It works fine.

crwdns2915684:0crwdne2915684:0:

open