Once you’re connected, you want to hit “cmd + R” from that boot screen. Unfortunately if you’re at UMass, eduroam (or UMASS) won’t work, however you can easily connect to any typical home Wi-Fi or a mobile hotspot (although you should make sure you have unlimited data first). Eventually you will see a screen where you can pick a Wi-Fi network. To get there, power the computer on, hit the power button and very soon after, hold the option key.
Luckily there is another way to connect, via apple’s boot menu. If instead your MacBook lets you select a Wi-Fi network during this process, you’re in the clear and can skip the next paragraph.
This tends to be because the Mac assumes it is already connected to Wi-Fi (when its not) and gives an error after it fails to connect to apple servers. There is a bit of a catch: if you do this straight away, there is a good chance that the Mac will get stuck here and throw up an error – error -3001F in my personal experience. The way forward is to use the built-in “internet recovery” which, on startup, can be triggered via pressing “cmd + R”. It may seem like you just bricked your MacBook, but luckily there is a remedy.
After the installation process completes, your iMac will automatically reboot into OS X Mountain Lion.If you’re anything like me, you will (or already have) accidentally wiped your Macbook’s ssd. For example, choose the hard drive you want to reinstall the operating system on and enter your Apple ID and password when prompted. The OS X Utilities window re-appears.Ĭhoose "Reinstall OS X" and click "Continue." Follow the directions to reinstall OS X Mountain Lion. Open the "Disk Utility" menu and choose "Quit Disk Utility" after the system displays the message that the disk has been successfully erased. The time for the process to complete depends on the amount of data on the disk. Click the "Erase" tab.Ĭlick the "Format" pop-up list and select "Mac OS Extended (Journaled)." Enter a name for the hard drive in the Name box and click "Erase." The system automatically erases the disk. If you only have one hard drive, it will be the only disk available. If the system does not automatically connect to the Internet, select your wireless network from the Wi-Fi menu to establish a connection.Ĭhoose "Disk Utility" from the list of options to open the Disk Utility window and click "Continue."Ĭhoose the hard drive you want to clear. Release the keys after the OS X Utilities window opens. Press the "R" and "Command" keys simultaneously and hold them when the system restarts.
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