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iMac minidisplay out not displaying colours properly

338 Views 4 Replies Latest reply: Apr 10, 2013 11:34 AM by Lmatt95 RSS
Lmatt95 Calculating status...
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Apr 5, 2013 2:28 PM

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: 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: Then when I unplug the TV from the iMac the dock goes like this, but nowhere else: 

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)
  • BDAqua Level 10 Level 10 (114,800 points)
    Currently Being Moderated
    Apr 6, 2013 10:47 AM (in response to Lmatt95)

    Hmmm, is the TV set to Mirror maybe? Does it also do it in Extended Desktop?

  • BDAqua Level 10 Level 10 (114,800 points)

    To find out if it's system wide or user specific, try this...


    Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.


    Does it work in the new account?


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