iMac minidisplay out not displaying colours properly

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iMac minidisplay out not displaying colours properly

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.jpgHere'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.jpgThen 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)

Posted on Apr 5, 2013 2:28 PM

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Answer 1

BDAqua

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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?

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Answer 2

Lmatt95 Author

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Apr 6, 2013 5:00 PM in response to BDAqua

It's the same no matter what option I choose. Extended or mirrored. I also noticed that the colours do not mess up on the dock which is very odd. Yet when I unplug the cable and the screen turns to normal the colours on the dock are now messed up. You can see the problem on the images above. It's just odd because it works perfectly on windows.

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Answer 3

BDAqua

Level 10

238,979 points

Apr 6, 2013 5:45 PM in response to Lmatt95

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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Answer 4

Lmatt95 Author

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Apr 10, 2013 11:34 AM in response to BDAqua

It's still the same on that new account. Colours are strange. It doesn't affect the main iMac display when you have an extended desktop but it does when ever you mirror the screen. When in extended desktop mode and I move a finder window over to the external screen and then back it changes to the strange colour when it's moved to that display... I checked the color profile settings for the screen but it looks normal. Very odd.

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