Long Boot

[ajay96]

So this is on a 2015 Retina MacBook Pro..

After I press the power button to turn on my Mac, I hear the boot chime, but then it just sits at a black screen for a couple of minutes before the apple logo appears. I tried holding down Alt/Option to see if I can manually select my HD, but that didn't work either. I only have macOS on here, and I even tried to reinstall Sierra to see if that would fix it, but nope. Could this be a hardware issue?

 

[BrianBaughn]

http://osxdaily.com/2014/11/22/fix-macbook-pro-booting-black-screen/

 

[ajay96]

http://osxdaily.com/2014/11/22/fix-macbook-pro-booting-black-screen/

I tried all of the steps mentioned there, they worked temporarily of the first few restarts after. When i tried to turn my laptop on in the morning today, the black screen is back.

 

[BrianBaughn]

Try running Apple Diagnostics ( https://support.apple.com/en-us/HT202731 ).

 

[dwig]

Try running Apple Diagnostics ( https://support.apple.com/en-us/HT202731 ).

+1, slow boot can be an early symptom of failing RAM or a failing HD.

 

[bingeciren]

In my experience it is usually a problem with the hardware. Number one culprit is either a disk with hard to read sectors, or some external hardware slowing the system down. If you have anything connected, unplug it all. If there is nothing connected externally, then test the boot disk first for read errors. If all of the above passes, then it is time to check the memory. Doing a hardware diagnostic test can also reveal if there is a problem with any component.

 

[ajay96]

I ran the Apple Diagnostics, and there were no issues found. I did have a flash drive plugged in, but even after unplugging it, it would stick at the blank screen.

 

[mysteryGenius]

-Unplug everything.
-Reset NVRAM.
-Shutdown.
-Power on holding ALT key to go to Bootpicker
-In bootpicker use arrow keys to highlight your startup disk (typically Macintosh HD)
-Hold down CTRL key and press Return.

That should fix it.

On boot, the blank screen before the Apple logo is where the machine searches for a bootable volume. The process above tells EFI where to look.

 

[ajay96]

-Unplug everything.
-Reset NVRAM.
-Shutdown.
-Power on holding ALT key to go to Bootpicker
-In bootpicker use arrow keys to highlight your startup disk (typically Macintosh HD)
-Hold down CTRL key and press Return.

That should fix it.

On boot, the blank screen before the Apple logo is where the machine searches for a bootable volume. The process above tells EFI where to look.

Looks like this fixed it!

Thanks everyone for the help.

 

[mysteryGenius]

Looks like this fixed it!

Thanks everyone for the help.

Cool. You're welcome.