2 Replies Latest reply: Jul 4, 2013 9:05 AM by nightotter
nightotter Level 1 (0 points)

I just set up a new iMac 27". It came with 10.8.3. I attached a second monitor before booting it up for the first time and it saw the second monitor fine. When I updated the OS to 10.8.4 it didn't see the monitor after rebooting. Nothing about the hardware changed, so I assume if I had hardware connection problem (not plugged in properly) it wouldn't have seen it with my first boot up of 10.8.3.


Second monitor (LG Flatron IPS236). It is connected by a DVI to Thunderbolt and the Thunderbolt into the iMac.


I have done and SMC and PRAM reset to no avail.


Any ideas?


Thanks, Otto.

iMac, Mac OS X (10.7), 27" - 16gb Ram | 2TB/205GB HD