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Rebooting back into Mac OS causes the black screen to appear too, again for several minutes although it does boot quicker than Win 8. Subsequent reboots into Win 8 take just as long. Once in, Windows functions fine, it just takes 8-10 mins to get there! It stays on this for several more minutes and eventually Windows fully boots. After about 5 mins the black screen turns to the Windows logo. I decided to leave it to see what happens. So, I've continued with Win 8 but upon rebooting it also shows the black screen too. #SHARPKEYS NOT WORKING WINDOWS 10 BOOTCAMP INSTALL#Not to worry, I needed a Win 8 install for testing anyway and I have aa dedicated Win 10 machine anyway. I placed the wrong USB stick in the machine and installed Windows 8.1 by mistake. ![]() I deleted the Bootcamp partition and reinstalled the partition and Windows. It kept on showing the error 'no boot device available' despite Parallels finding the Bootcamp partition and MacOS showing it as a boot option.Īnyway, I use the Windows install for testing purposes so I didn't have many applications installed on it and all my work files were on the Mac. Screen grabs below of the disk utility info - you can see it lists Bootcamp as having no files and not bootable, but it appears in Startup Disk as a boot option, and opening the Bootcamp partition shows folders and files. I tried again and this time after leaving the computer on the black screen for a few minutes MacOS thankfully appeared, hence I'm typing this message! 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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