I built a quad core system last June '08 using Intel's DG33TLM motherboard. Everything has been working fine until last week when I was trying to encode some video for my iPhone. I have been using Handbrake which was working great. In the past, I have noticed that Handbrake uses most of the CPU resources and cpu utilization is close to 100% for all 4 cores. Last Thursday, my system started shutting down due to overheating when running Handbrake. This happened under both Windows 7 beta and Vista Ultimate. When I am not running Handbrake, everything is fine. Does anyone know what is going on? Thanks in advance for your help.