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annettebe Author

Level 1

4 points

My Mac shows “error in installing macOS “ and won’t open

My Mac shows “error in installing macOS “ and won’t open. Do I need an external start up disk?

Posted on Sep 29, 2020 7:06 AM

Top-ranking reply

leroydouglas

Community+ 2024

Level 10

188,532 points

Posted on Sep 29, 2020 7:31 AM

annettebe wrote:

My Mac shows “error in installing macOS “ and won’t open. Do I need an external start up disk?

What exact Mac?

What macOS are you cirrently running?

What are you trying to install?

Do you have adequate free storage space on you drive?

Did you try from a a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login

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My Mac shows “error in installing macOS “ and won’t open

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