My Mac Pro 1,1 (two dual-core 3Ghz) has begun to have a blue screen flick on intermittently for a second or two. Sometimes the blue screen may not happen for over an hour and then it may happen a few times in a few minutes. I did a Safe Boot and reset the pram but there was no change. I was going to run Apple Hardware Test but after some Google searching it seems that Hardware Test probably won't spot the problem if it is the 7300GT video card I have in the machine - which is what I suspect is the problem. Based on doing a search of this forum and a Google search, it seems like the cheapest replacement I can get for the 7300GT is the ATI Radeon HD2600XT. (I don't do anything that needs a higher "power" video card.) Does anyone know if either one or both of these cards will work in my Mac Pro: http://www.compuvest.com/Desc.jsp?iid=1363386 http://www.compuvest.com/Desc.jsp?iid=1314694 If not, what cheap video card might you recommend for my Mac Pro 1,1 and where might be a good place to obtain it?