18 авг. 2013 г. · 1 Restart your Mac and hold down the Option key until disk icons appear onscreen. 2 Select the startup disk with the operating system you want ...

19 янв. 2017 г. · Shut down your Mac. Disconnect the power source. Press Shift + Control + Option on the left side of the keyboard, then press the power button at the same time.

29 апр. 2019 г. · The problem arises when I load into windows 10 and it can't boot back into the Mac portion because windows can't load the Mac OS boot volume.

31 янв. 2021 г. · Tests: 1. make sure it's the left alt you press. 2. Try an Apple keyboard, sometimes Win keyboards simply "don't work" at boot.

19 сент. 2013 г. · I know it is necessary to wait until the boot chime sounds before depressing the option keys, but I don't hear the chime unless I reset NVRAM.

28 окт. 2023 г. · My best guess would be to reinstall the Windows boot files. This answer assumes you are UEFI booting Windows 10.

5 мар. 2021 г. · The error message appears when there is no partition flagged as active in the Master Boot Record (MBR) partition table.

11 дек. 2020 г. · The only startup key combination that works is cmd+S. I also tried with bootable USB devices but the option/alt key doesn't work to select boot option.

23 мар. 2017 г. · When I boot by holding the option key, all I get is a white screen with a mouse pointer which i can move around.

30 дек. 2022 г. · How to reinstall High Sierra if pressing Option key did not bring bootable disk on boot · Try resetting the NVRAM: support.apple.com/en-us/ ...