OCUK built it, they set a profile on the bios, they expected their settings to be running off the bat as they set every PC up before sending it out. For some reason I don't think it was loaded when I got it (possibly on default board bios settings). Ram said it was running at 4800mhz. Tried turning expo on and that's when things didn't run properly, booting to safe mode etc, pc would boot when on the default settings so I kept it at that while I tried all the options above. After email exchange they said to load the profile and here we are, all working.