So When I am playing league of legends every so often my computer screen goes black and the speakers emit a loud errrrrrrrrrr sound. The problem has gotten worse because I am now playing Dragon Nest and everyone hour of gameplay the computer crashes. I have cleaned out my computer, no dust what so ever, even have a fan at the side of my computer with the two fans that are already built in. People have told me this and that but no one is helping really. This is what I have computer wise. An XFX 750I Intel 775 DDR2 Motherboard 8 GB of ram which are DDR2 2 geforce gtx 285 nvidia graphic cards that are sli bridged. And an Intel(R) Core(TM)2 Quad CPU QB8200 @ 2.33GHZ System is 64 bit Running Windows 7 Ultimate Now what I have tried is doing a Furmarks test and in 2 minutes I get to 100 celcius I have no problem dropping 300 bucks for a coolant system but if I have to do that I want to make sure that it is a heating problem and not a compatibility problem or something. Also I have uninstalled my graphic drivers and reinstalled with site updates from nvidia. And I have gone into my event viewer and found this critical error that is at the same time as when my computer crashes. Kernel-power 41 All the variables are 0 though. The site says that this happens when the computer turns off unexpectedly and it fills in a 0 which means that it isn't a power problem cause that would be a numbered response. This is problem for me. And I might just be to deep in my frustration to be over looking or being able to find a way. I can't even find out if my gear is compatible with itself. I am getting some kool aid for myself right now. Please if anyone can help let me know I will be checking this hourly. Oh and also I have direct X and all required software for my games. And I have uninstalled and redownloaded and reinstalled my games multiple times but still have the same problem.