![]() The utility will fix any problems or warn you of a S.M.A.R.T hard drive error. Select Disk First Aid to test the hard drive for problems. At the bottom of the list is Disk Utility. When you reboot, you’ll see the OS X Utilities window. Don’t have recovery mode? You’ll need an offline Mac installer Reboot your Mac and hold down the command and r key down at the same time to enter Recovery Mode. ![]() Apple’s Disk Utilityis the first place to start. Don’t proceed before you try to make a backup. Again, you should already have a backup of your Mac. If you suspect your hard disk is failing, it is time to make a backup. ![]() That could be because your Mac is waiting on the hard drive. Other times you’ll get the spinning rainbow wheel, letting you know your Mac is waiting on something. After turning off your Mac and turning it back on, the system boots just fine. no symbol at startup or a flashing folder with a question mark. Sometimes you’ll get the prohibitory no symbol at startup or a flashing folder with a question mark. ![]() Not all drives exhibit symptoms in this way. ![]()
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