recheck that the solder point for D0 is attached to the correct point (the one circled in grey on the diagram , not white), but do not tug to see if it's attached or you will lift the pad off the motherboard, secondly, make sure you have correctly installed the power/eject hijack as well as the red wire from hijack to modchip (also slightly of chance, make sure you installed all wires the correct side up without bending any pins)