IF cant turn on with no power at all.. anyway not related to aircon itself, for the power supply wiring can be failed also... anyway my MXY-GE24VA same problem also, after technician come and check for the wiring broken half way, just change the better wires as full brass, settled. Just changed and turn on like normal. Like ME much more easy to check on FCU, just open up the front cover and use test pen and check on the wires input located at right hand lower side, brown color must be have light on, IF the blue color wire also had light on, meant the wire already failed. IF you unknown it thing, later the aircon guy come over and they claims on others expansive parts to be change also.