How can I force YUV mode on HDMI to DVI on external monitor

I have a HDMI to DVI going from my mac to my external monitor. Is there a way to force YUV mode (instead of RGB)? RGB shows as pinkish. If not, I guess I will have switch to a thunderbolt / DVI so RGB will work by default?
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Are you sure you have an HDMI to DVI cable or a DVI to HDMI that you are using in reverse.  They may work, but if you have pinkish hue that could suggest that the connection is not fully in contact or there is interference.

though the above are mere suggestions,
Agree with arnold about a loose connection.
Adding If you can't adjust the colours on your 2nd external monitor, open that monitor's colour settings and adjust> the hues and mids or if it supports it Pal or NTSC
then I would suggest to you to convert your HDMI to DVI >> 8in HDMI to DVI-D Video Cable Adapter - HDMI Male to DVI Female - HDMI to DVI Dongle Adapter Cable
What is the model of this external monitor?

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m2ewAuthor Commented:
Its a 24" ViewSonic - The code I get is VX2433wm in monitor settings. Anyways, after recent mac osx update, it appears to have been fixed. I'm guessing though it was some sort of contact issue. Thanks for the insight
Glad to see it's resolved so simply.
All the Best :)
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