Hello. I'm having a strange problem with my computer. The display seems to get washed out (brighter and whiter) and when playing CoD the system just locks up after a while (about 20 min). I have a 4600 with an ATI Radeon 126 9800 PRO. I purchased the card about 6 mnths ago. Does this sound like a card problem and what would be your suggestion for a fix?