For the past months my computer has been crashing (monitor and computer both still on, but screen black). This only happens when I am on hard to run games such as World of Warcraft. I have also noticed that it crashes MOST of the time when there is a lot happening on the screen. I have looked into it possibly being a graphics card problem, I have gotten newest drivers, fans, even REPLACED the entire last card (Geforce fx 5200, to a Geforce 6800+, which cost me $180...) I know very little about power supplies, but I THINK mine is 250w, and I do know that it is the original power supply for my 3 year old Emachines.. so I think it is about time for a new one since I have replaced most of the parts in the computer. If anyone could lend a hand I would appreciate it.