Step 4: After the installation is complete, reboot the Mac to see if the problem is fixed. The problem may also occur when your USB controllers are unsupported, if this is the case you should add the appropriate kext to /EFI/CLOVER/kexts/Other/ or try GenericUSBXHCI.kext. Step 3: From there select the Reinstall Mac OS option. May need PMHeart’s patch to remove XHCI USB Port Limit in ist. May require XHCI-300-series-injector.kext or XHCI-200-series-injector.kext in /EFI/CLOVER/kexts/Other/. May require USBInjectAll.kext in /EFI/CLOVER/kexts/Other/. Try connecting your USB flash drive using a USB2 hub.Įnsure that Fast Boot is not enabled in your BIOS settings. You might also try enabling Legacy on your USB3 ports in your BIOS settings. You will likely need to use Internet Recovery and then use Disk Utility from within it. If it still doesn't work you could try another flash drive. 1 - Format your new MacBook Pros drive as you have it all messed up. Repeat until you have tried all USB ports. If this is the case move it to a USB2 port, if it is already in a USB2 port move it to another and try again. Plug in your macOS High Sierra bootable flash drive. This is usually because the flash drive is in a USB3 port. Step 1 How to Install macOS High Sierra With the device powered off, disconnect any external hard drives and flash drives. Next, install the MacOS High Sierra as usual on the desired volume. Contact your IT department for more help. If you're using your Mac at a school or business, it might be trying to start from the wrong version of macOS. After installing the OS on them I get the same circle with the slash through it. When you see a circle with a slash symbol instead of the Apple logo, it means your Mac couldn't find a valid System Folder to start up from. Share Improve this answer Follow answered at 8:07 Doc G. Adding a leading '/' to each occurrence of 'Volumes' should eliminate the error. When booting from USB means that there is a problem finding a valid System folder to start up from on your USB flash drive. I installed two different brand new solid state hard drives into it. Unlike previous versions, the High Sierra installer requires a 'POSIX-ly correctly formed' path to the locations of both the installation source and the installation target. Building a CustoMac Hackintosh: Buyer's Guide
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