Graphics Card ATI RadeonHD2600XT Mac Pro 3,1

I work on a MacPro 3,1. When I try to select/highlight some text there is NO highlight but the text is selected. If I try to color-code with labels, they are very washed-out looking. Went into displays (I have 2 27" cinema displays circa 2007) to calibrate and the slides were either black or gray, in other words the controls were useless. I don't have any issues with the monitors blinking or flickering. That's why I tend to think it might be a graphics card issue. Can you shed some light on the subject. I let techtool 6,x run defrag over the weekend. Everything from TechTools point of view seems ok. Video card or graphics card. Either way, I'd appreciate your knowledge. I ran the hardware tools disk from apple and everything checked out fine. My monitors continue to get more and more bleached-out looking no matter what kind of settings I try to use to try and balance the colors and contrast. Should I be seeking a new graphics card? Is there a way that I can definitely tell what is the problem? I switched monitors around as well. We have some extras laying around from artists that were given iMacs for their new machines. But that did nothing. I am totally stumped. I'm afraid it's really something like a motherboard. I don't want to waist any money replacing a graphics card if it's really the motherboard. Thanks for any and all help. Sincerely, Paul