So I have an hp m8400f and I just recently (or at least I think) blew the graphics card. I say I think because it I had Kerbal space program open and my dad had a bunch of windows open and he said the screen froze and then the no signal message displayed on my monitor. It currently has the nvidia 8500 gt but he wants to be able to run a dual monitor setup. That's is really my only requirement. Not looking to spend $500 but I don't mind a couple hundred. Here is a link to the other specs,
http://h10010.www1.hp.com/wwpc/ca/en/ho/WF06b/12132708-12133156-12133158-12133158-12133158-81959348-81979614.html?dnr=2
http://h10010.www1.hp.com/wwpc/ca/en/ho/WF06b/12132708-12133156-12133158-12133158-12133158-81959348-81979614.html?dnr=2