After 2 days my computer resurrected itself

I went to an apple store yesterday to make an appointment to see if they could actually fix my macbook pro laptop from it's zombie state where I couldn't turn it off or on where it stayed in this strange state where the little white light didn't go up and down in brightness but stayed on all the time when the laptop was closed but then when I opened the laptop it went off and the screen was completely black and off.

Finally yesterday after making this appointment my laptop when I opened it up was back and I just turned it on and ran an Anti-virus, so it had reset itself after being a zombie a couple of days. So, I emailed the apple store to cancel the appointment.

So, I guess my laptop had resurrected itself after 2 days of being basically dead.