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I installed Windows 10 using boot camp on a separate drive. Now I can't boot in my regular Mac OS now, even when I use the option key at startup. It's booting straight into Windows 10. It's also not resetting PRam or SMC.

I installed Windows 10 using boot camp on a separate drive. Now I can't boot in my regular Mac OS now, even when I use the option key at startup. It's booting straight into Windows 10. It's also not resetting PRam or SMC.

Mac Pro, macOS 10.13

Posted on Nov 30, 2019 10:24 PM

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Question marked as Top-ranking reply

Posted on Dec 1, 2019 2:10 PM

If neither of these work perhaps the Internal Drive chose this time to die???


Have you done a PRAM reset, CMD+Option+p+r...


http://support.apple.com/kb/HT1379


In fact, do 3 in a row, takes a bit of time.


Intel-based Macs: Resetting the System Management Controller (SMC)...


http://support.apple.com/kb/HT3964

7 replies

I installed Windows 10 using boot camp on a separate drive. Now I can't boot in my regular Mac OS now, even when I use the option key at startup. It's booting straight into Windows 10. It's also not resetting PRam or SMC.

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