I don't know how old your talking? My board is a 939 pin board (Asus a8n-e), its not that old! It does it when I'm not doing anything, just sitting there maybe reading on the internet. As I posted, my temps are CPU 36-40c, GPU 40-41c, Motherboard 35-39c Idle. In the BIOS I believe its set to shutdown when the CPU reaches 72c. When it shuts down all I have to do to turn it back on is push the keyboard tray in.