Hello everyone, I has been using Mac Pro over 4 years, last night I shut down the Mac before I went to sleep. Next morning as usual I wake up and power on the machine but this time it cannot power on, then I google it and find same symptom like my case https://discussions.apple.com/thread/7569129 . I press the power button I can hear a "click" sound but it don't power on, after wait a few sec I press again and hear a "click" again and the machine still off. Any help would appreciate. Thank. you.