LG Monitor and New Mac Pro -- Colours out of Whack

I have an LG L226WT and a 20" Apple Cinema Display connected to a brand new Mac Pro.
Both monitors (in the same configuration) were running on my old PowerMac G5 before.
The Cinema Display works fine, colours are good, so is light etc.
The LG first had ghosting (severe at that) and this morning the colours are totally out of whack. Looking at some photos I had taken a week ago and colour corrected on the G5 now look like a child painted them (on the LG monitor, on the Cinemadisplay they are fine).
It's not the graphics card either. If I take a screenshot on the LG and look at it on the Cinemadisplay the colours etc. are correct, but the LG is right now pretty useless to me. I tried to calibrate it but the end result is pretty much the same, it just does not seem to want to play nice.
I don't think it is the DVI cable, as it is securely screwed in and in the same location as on the PowerMac, turning the monitor off / on seems to resolve the shadow problem but not the colour issue.
Anybody have experienced this? Any tips outside of trashing the LG and buying a new screen?

The ghosting issue is still one when I first turn the computer on. I found that I have to turn the monitor off and on and it resolves the issue.
I also found the source of my colour problem, it comes down to the LG "resetting" itself to some "automatic improvement" or whatever you want to call it, which completely messed with the tones. After I turned that "feature" off it worked well, but man, that took me three days to figure out.

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