I have now finished my xbox mod and tried to turn it on and the pc wont boot. The fans spin up and the led on the h100i turns on and then after about 5 seconds it shuts down again. Anyone have any suggestions as to how to fix it? Edit: worked out the problem, the power button was shorting it
It is the Xbox power button PCB and the tact switch turns it on and then shorts out after 5-10 seconds, currently using a temporary switch poked through the front of the xbox.