オリジナル投稿者： Carsten Dahl Hjarup ,
Hi David, Recommend to check more on the power supply. check standby voltage https://www.youtube.com/watch?v=kmGVdUjW6X0 check all voltages as well on the connector from power supply to the main board. (make a list and post on ifixit, it may enable people to help you) Measure voltages Both with motherboard connected and not connected. This hopefully can tell you if the fault is in the power supply. best of luck.