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Booting on external SSD only shows black screen

For the past several months, I've been booting off of a Samsung T5 external SSD for school projects. As the computer turns on, I hold down the Option key, which allows me to select the drive I'd like to boot off of. It's worked very well for my needs.


Now, after I select the external drive to boot from, it just goes to a black screen that hangs indefinitely. I don't know what changed. Any advice appreciated, thank you.

MacBook Pro 13", macOS 10.14

Posted on Jul 12, 2019 9:28 PM

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Posted on Jul 13, 2019 1:31 AM

Hi,

Resetting NVRAM could solve the issue.

https://support.apple.com/en-us/HT204063


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Booting on external SSD only shows black screen

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