crwdns2934241:0crwdne2934241:0 Dan

crwdns2934249:0crwdne2934249:0:

Try connecting your iMac to an external monitor, does the problem show up on it? If it does then you know the graphics board is bad. If it looks OK, you know the display or the LDVS cable has a problem.

crwdns2915684:0crwdne2915684:0:

open