I am trying to overclock my new MSI P67A-GD65 motherboard with i5 2500k. I haven't done this before, so I've been using mrface's guide. I basically followed his instructions and right now am running stable at 4ghz, vcore 1.25v. Everytime i boot, the system starts up, shuts down, and takes 2-3 times before it can get to bios or windows. Even if i run at stock 3.3ghz settings with the other settings changed with his guide, it does the same thing. When i reset to stock settings, i dont have this problem. Any ideas on what's causing this?