4 Replies Latest reply: Apr 10, 2013 11:34 AM by Lmatt95
Lmatt95 Level 1 (0 points)

Basically I have a 39" TV that I have plugged into my iMac using VGA and a minidisplay port to VGA adaptor. The output on my iMac is fine, I tested it with an old 17" monitor and a new 21" monitor. No problems whatsoever. The TV is working fine as well, it's brand new. Earlier today I had the iMac plugged into it with no problems. I tested the TV with a laptop over VGA and it seems to be displaying properly. This is the iMac display normally:http://i.imgur.com/x6haCVg.jpg Here's where it gets odd, when I plug the iMac to the tv now the screen on both the iMac and TV goes like this: http://i.imgur.com/tJNiDd6.jpg Then when I unplug the TV from the iMac the dock goes like this, but nowhere else: http://i.imgur.com/3duBvOc.jpg 

I have no idea what the problem would be, everything seems to be working fine.

Yet when I rebooted to my bootcamp partition everything worked fine.

iMac, OS X Mountain Lion (10.8.3)