Subsequent force shutdowns and pressing Alt on startup still didn't produce the the boot OS selector.Īfter Googling I found the key combination of cmd+ctrl+r+p which forced the computer to do the boot chime twice in quick succession. I then had a panic as force shutdown and rebooting (but not pressing Alt) as normal did not boot into MacOS any longer, it just went to the black screen again. The computer restarted, boot chime and then black screen, nothing. I then went into System Preferences/Startup Disk and selected Bootcamp from the list, and clicked Restart. This time I didn't press Alt and the computer booted into MacOS as normal. This time I left the machine on the black screen for about 2 mins and nothing happened. I restarted, pressed Alt and the same happened. I had to press the power button for 10s to switch off the machine. No flashing cursor, not boot OS menu selector, nothing.
Last night I went to boot into Windows by pressing Alt and got nothing but the Mac boot chime and then a black (blank) screen. I could boot into either OS using System Preferences/Startup Disk to select the boot OS, or by pressing Alt at the boot chime to enter the boot OS selector menu. Earlier this year I installed a copy of Windows 8 Pro and upgraded to Windows 10 before the free update period expired.Īll had been working fine until last night. I have a 2012 Mac Mini i5 running MacOS 10.10.5.
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