Mac Turns Off After Login
How to Turn Off Password Login on a Mac. Turning off password login on a Mac is a simple one or two-step process. In order to disable password login, simply access your System Preferences and make a few changes to your Users & Groups
Sometimes it's the single most effective solution when your Mac won't turn on, or continuously crashes. Press the Power button while holding down Shift Release the Shift key after login dialogue shows up
My macbook turns off itself during startup, after the apple logo appears.. Help! Macbook (pro) turns off halfway through startup…! Do you see the Apple logo, and a loading indicator (bar), and after a while, does your Macbook shuts down itself? If you have the same problem like us, you should keep read this blog post.
And voila, your MacBook should boot as normal instead of to a black screen. Step 4: Resetting the NVRAM/PRAM. Or… not. If you're still having problems even after trying multiple methods or the problem is re-occurring it might be time to take a bit more drastic measures. You'll be resetting the NVRAM/PRAM on your Mac — here's how to do it.
My laptop won't boot. When I press the power button, the gray screen appears (with the apple logo and spinning circle) and the chime sounds, but after a bit the laptop just turns off. I didn't drop the machine or spill any liquid on it. I've never had any problems with the battery.