I have this wierd squealing noise, something like a capitator whine on my 6850. Now the strange thing is... this only happens in one game; Minecraft. And it only does it when I'm in the options or world select list. Everything else is fine ingame and other games, even when running a stress program like Furmark the card is silent (apart from the fan). This is confusing me, why is it making a squealing noise ONLY in the options/world list? Should I be worried?