Hi there, I'm new here, hope you can help me out with my problem. So over the last couple of weeks I upgraded my (I've had this for about three or four years now) : CPU: FX-8350 Mobo: Gigabyte GA-970A-DS3 RAM: 8GB 1333MHz (2x4GB) GPU: RADEON HD 7870 (GHz Edition) PSU: 750W Novatech To: CPU: FX-8350 Mobo: Gigabyte GA-970A-DS3 *RAM: 16GB 1600MHz *GPU: R9 290X MSI GAMING PSU: 750W Novatech [* = New] And added in two SSDs. I also upgraded to Windows 8. Since I upgraded I've been getting these weird black-screen crashes whereby the lights turn off on the keyboard and there's no response at all from the machine but the fans are still on at full speed. I have to then turn the PSU off or unplug it. Then I have to wait a few seconds before giving power back to the PSU in order to turn it all back on. The first time the crashes happened was when I was playing COD:AW and loading a map like Detroit or Recovery. After I turned off Preload Shaders (Which allows you to load up more information during the loading screen so that you have a smoother experience after it) that crashing seems to have stopped. So I just thought that was a bug with COD, until I started looking at overclocking my CPU. I ran Prime95 just to look at the temps and after a couple of minutes I got the exact same black screen crashes. I think it might be the PSU, because it's old and technically a 'value brand', but I don't want to fork out on a decent PSU only to find it was my Mobo or CPU all along. So, yeah, any advice would be appreciated.