Hi Ive had this problem when I'm in Battlefield Bad Company 2 (not tried anything else) and the temperatures are around CPU:50 and GPU:75 (roughly) and suddenly my whole computer will stop responding and there's a constant beep, this beep comes from the speakers, and must be restarted to do anything. Not sure if its related but the day before this started I reinstalled sound drivers. I have checked the registry and I am doing a virus scan over night, I will do a RAM test when the scan is complete also a disk fragmentation just in case. Any other ideas? Or what the problem is? My components: CPU: i7 920 @3.6GHz GPU: Nvidia GTX 570 RAM: DDR3 6GB MoBo: Asus P6T deluxe v2 PSU: FSP 700 watt (i know ) Windows 7 64bit Everything is about 3 years old other than the GPU which I got at Christmas. Any Help would be much appreciated, thank you for your time.