Just right-click the partition in the left-hand column of the page, then choose Unlock and provide your password. Erase the partition you DID follow the instructions to back everything up, right? This erases all data off the drive. This will guide you through the basic configuration information. Choose the same partition you just formatted as the install partition, give the installer a few other pieces of data, then sit back and relax.
In about 10 minutes, the installer will reboot the system. Do not hold down any keys during this reboot, and the Mac will boot into the newly-installed OS X partition, install remaining components of OS X, and walk you through the standard OS X first-start routine.
You now have a newly-installed version of OS X on your machine, with no trace of any of the old apps, settings or data. At this point you should immediately go to the Apple Menu, select Software Updates and let everything download. Do this at least twice, but optimally you should do this until no updates are available. Now you can install applications and start restoring data from your backup to your fully renewed OS X installation.
Try some of the tricks in previous articles reset PRAM and other system settings, clean up permissions, etc. However, if a clean reinstall is called for, at least for Lion and Mountain Lion, Apple does make it pretty painless. This prevents your Login Items from loading. Delete any such items and restart your Mac normally. All should now be well.
No Wi-Fi after waking from sleep Numerous users report that, after waking their Mountain-Lion-upgraded Mac from sleep, the Mac does not automatically re-connect to the local Wi-Fi network. Making matters worse, attempts to manually reconnect may lead to a persistent spinning beachball, making reconnection just about impossible. A solution that has worked for at least some users is to: Unfortunately, this is not a sure-fire fix. Many users with this symptom continue to struggle to find a cure.
A few suggest that incompatible third-party software is the root case. A few have found that turning off Bluetooth eliminates the symptom. Avatron believes the cause is a bug that Apple will likely fix in Mail replies from wrong address As reported by Kirk McElhearn who cites an Apple Support Communities thread on the matter , the new version of Mail in Mountain Lion has trouble assigning the correct address for email replies.
This should override any selection you have made for a default address to use with new messages. The problem is that Mail may now instead use your default address for replies, ignoring when the received message comes from a different account.
Postings in the Apple thread offer some potential workarounds, but not any outright fix. On the other hand, you may not see this symptom at all. The white star that should appear in the corner of a listed page, when the page gets updated, no longer shows up. There is no known fix.
Find answers with millions of other OS X Mountain Lion users in our vibrant community. Search discussions or ask a question about OS X Mountain Lion. OS X Mountain Lion (version ) is the ninth major release of OS X (now named macOS), Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mountain Lion was released on July 25, for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year, rather than every two years or rcawqd.meper: Apple Inc. OS X Mountain Lion is available now as a download from the Mac App Store. Just click the Mac App Store icon in your dock, purchase Mountain Lion, and follow the onscreen instructions to install it. Mountain Lion will not only make your Mac work better, it also makes your Mac work even better with your iPhone, iPad, and iPod touch. Because it comes with iCloud, your mail, calendars, contacts 4/5(1).
Still, things can and do occasionally go wrong. It always pays to be cautious before upgrading to a new version of OS X. Your first caution should be to make sure that nothing bad happens as a direct result of the install process itself. Bob LeVitus offers an excellent brief overview of what you should do before clicking the Install button. Make a copy of the app before proceeding. Otherwise, the app will vanish without a trace after you complete the install this is a deliberate feature, not a bug. Yes, you can get it back by re-downloading the app, but keeping a copy saves you time and hassle, in case you ever want to use Install again.