So I go into the "BIOS" of my P8P67-Pro and enable overclocking on my Intel i5 2500K, and it does it's stupid auto-OC which I let it do just to test. It's doing 3.3Ghz to 3.8Ghz, which isn't much, and then when I reboot it just kind of boots up into a black screen, then boots up again and when I go into the BIOS it is still running at 3.3Ghz.

I have a Noctua NH-D14 so I think I should be able to get at least 4.2Ghz. What the fuck am I doing wrong? I followed the renowned bit-tech guide and then adjusted the multipliers to 38.