It freezes. The image stays on screen and my cpu fan goes wild until I hard reset. Just happened again when I was simply browsing the net. I checked the temperatures right away after reboot and it was normal (around 38C). Hasn't happened while doing anything intensive like gaming. I made sure I have all the latest drivers including BIOS ver. 1.4 (MSI mobo) and I did a virus and malware scan which turns up nothing.