Contents
How do I fix prohibitory sign on Mac?
A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it’s not a version or build of macOS that your Mac can use. Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.
How do I boot my Mac after installing a new hard drive?
I hope it works for you.
- Install the NEW hard drive back into Mac.
- Connect the OLD device to the SATA/IDE connector, connect the USB to the Mac and turn on the power to the new hard drive.
- Hold down the Option key and turn on the device to choose which device to boot to.
How do I format a new SSD for Mac?
Choose View > Show All Devices. In the sidebar, select the storage device you want to erase, then click the Erase button . Click the Scheme pop-up menu, then choose GUID Partition Map. Click the Format pop-up menu, then choose a file system format.
Is the new Mac OS High Sierra available?
MacOS High Sierra is finally ready for release. It endured the summer beta program, and is now available through the Mac App Store for anyone to download and install. (macOS High Sierra’s initial install screen.)
Can a fusion drive be used for macOS High Sierra?
Apple has posted instructions in its support area for Preparing Your Fusion Drive Mac for the macOS High Sierra Install. It covers two methods for converting a Fusion Drive back to HFS+ and installing macOS High Sierra. The instructions are a bit sparse, but should be sufficient for getting the job done.
Do you need to drop back to recovery to install high Sierra?
There is no need to drop back to Recovery to download (and Install) High Sierra. As macjack says, you can do it right in the running (older version of) MacOS. But there is a need to initialize your new SSD to the default GUID partition Map and HFS+ Volume, so that is will appear empty and AVAILABLE for the Installer.
What to do if you have problems with macOS High Sierra?
Once the Mac App Store finally quits, go ahead and restart the store. Select macOS High Sierra and start the download again. If you still have problems, quit the Mac App Store (using force quit, if needed), and then restart your Mac. Return to the Mac App Store and try again.