I'm having a strange issue that my computer shuts down whenever I run a game. Sometimes when I turn the pc on, there's no display and a red light on my graphics card. However my computer runs fine while doing other task such as watching movies etc. My specs are : Radeon HD5970, Intel Core i5 @ 3.3 ghz, intel Motherboard, 4GB RAM, 1 HDD, 1 SSD, 600W power supply. Your help will be appreciated !