My macbook was working ok last night.
I cannot turn it on this morning, like completely dead.
I tried to hold the power for 10 seconds , with power and without power....
Then, i called apple.
the way i fixed it was:
disconnect all cables from my mac, then, hold, shift+ control+ option + power for 20 seconds.
then wait for 5 seconds. then click the power button.
my mac back to login window and i can login and use