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There have been many reported bugs and even blank gray screens that prevent access to the system, so if you install over your current OS, you're risking having to boot into recovery or reinstall from the ground up.
MAC OS X MAVERICKS 10.9 MAC OS X
Note that if you have a Mac with an optical drive you can also use the installation disc to install direct to that operating system.For those of you who've already gotten Beta Preview or Developer Preview access to Mac OS X 10.10 Yosemite, I highly recommend installing it on a separate partition on your hard drive. Install the OS X version that is provided with Internet Recovery, it depends upon what originally came on the machine (typically it will be either Lion or Mountain Lion). Reset the Mac and hold down the Alt key and choose the Recovery USB drive. When Disk Utility has finished exit the program by choosing Disk Utility and Quit Disk Utility. Note that this permanently erases all data on the hard drive so don’t do this unless you’ve cloned the drive or are happy to never have to get something from that drive again. If you want to securely erase the drive choose Security Zero Data One-Pass. Now choose your Startup Disk in the sidebar on the left, and click on the Erase tab. Select Disk Utility and click on Continue. How do I restore my Mac with Time Machine.Restart the Mac by clicking on Apple > Restart and hold down the Command and R keys until the Recovery Mode Utilities window appears. You need an internet connection to install Mac OS X.
MAC OS X MAVERICKS 10.9 HOW TO
How to reset a MacBook: restore your Mac to the original factory settingsįirst of all make sure you are connected to the Internet (open Safari and browse around).
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Choose your main hard drive in the source, and your external hard drive in the Destination. The best way to do this is using a program like Carbon Copy Cloner or SuperDuper along with an external hard drive. Also you can keep this around and pick files from it to copy over to the rolled back installation. This can be useful in case of emergencies (you can boot from the hard drive) and you can re-clone it back to the main drive if there’s a problem. It’s important to make a clone of the whole hard drive and keep it around for a while. This will download the Installer file to your Applications folder. Look for the Mountain Lion purchase and click on Download next to it. If you purchased it from Apple then you can open the App Store, and click on Purchases. If you haven’t go this file, then you’ll need to go hunting for it. Open the Applications folder and check for the Install Mac OS X Mountain Lion folder. You may already have this if you’ve done an install before. The first thing you need to do is get a copy of the Mountain Lion installation file. Step 1: Get a copy of Mac OS X Mountain Lion
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But for general use Mavericks is better than Mountain Lion in almost all respects (including speed) so we’d suggest you stick with the newer operating system if possible. It’s by no means easy to roll back to an earlier operating system, and we wouldn’t advise it unless you have a real need to be on the older operating system (say if you have a vital program that requires the older operating system, or you’re testing out on an older operating system).