I don't have a meter, so I can't do what you suggested.pcmanbob wrote: ↑Sun Feb 03, 2019 6:29 pmThere is a fault that can affect a pi3B+ were by the voltage regulator chip fails after the first boot of the pi.
If you have a meter you can test the pi to see if it has failed by testing between the first 2 pins on the gpio and ground one should read 5V and the other 3.3V , just be careful you don't short any of the pins or you could damage your pi if it has not failed.
If the 3.3V is missing then your pi has suffered this failure and you should contact your supplier.
Does the Pi have to be connected to a monitor, keyboard and mouse all the time?
Try checking if the cable is connected properly.
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shutdown -h now
I didn't even turn it off. It was "on" the whole time, I'm accessing it through VNC Viewer and it was not responding. When I connected it to monitor, it was showing blank. So as I was unable to access it, I though turning it off and on would solve it, but even then it wasn't showing up, the green light wasn't flickering. Just a red stable light.