I've a macpro early 2008 model and noticed my screen goes completely blank after 10 minutes or so using and have to wait an hour to re use it again. last night my screen was flickering and now it won't budge, I also tested with another monitor and it won't work. Do you guys think the graphic card die on me? Have someone experience this before? before it die on me I did checked the energy savings settings and they were normal.