Same problem here. I placed my MB inside a casing a week ago so that it will not be accumulating dust. Last night when I turned on, it won’t. I tried every fix that would be possible including opening its back to remove battery, SSD card, and display, I tried also the CTRL+OPTION+SHIFT+POWERON. Still it did not work. It does not turn on the fan nor attempt to turn on the fan but when I connect a phone charger, and press the power button, it quickly charges but suddenly stops charging. However when the Macbook's power adapter is connected, it charges the phone charger and continues charging. I also did resetting the NVRAM which is OPTIONS+COMMAND+P+R but still would not work. Any help is highly appreciated.