I have a Mac Pro 10.6.8. I have it hooked up to my Sony Flat screen through VGA. Yellow Tint?

It showing a yellow tint. I'm not sure if i've had this exact problem before but i remember my color acting up and i just changed the Display size and that seem to fix the problem. I know it's not my t.v. cause when i turn the Mac off, i get all the colors back on my T.V. when it goes into sleep mode.

I tried all the calibrations. Doesn't do nothing for me.

So i'm just wondering if it's my video card?

here's my computer specs.