My Mac would turn on but it would get stuck on the white screen upon startup after chime. This means that OS X can’t start because of problems with the system’s hardware or software. If your Mac fails to start up normally, there are a few things that you mat try to troubleshoot. First of all, there could be many issues, so fixes described here may not fix your problem. If you are having this problem, try steps below until your issue is resolved:
2.Run Disk Utility
Turn your Mac off by holding down the power button for a few seconds. Turn on your Mac and hold down the Command and R keys until you see the Apple logo. Then you should see a “Mac OS X Utilities” window. Select Disk Utility, click your OS X hard drive and select verify/repair disk.
3.Reset PRAM
This may fix your boot failure. PRAM (“parameter random-access memory”) stores some of your settings. You may reset PRAM. To do that, turn off your Mac. Now turn on your Mac. Then, immediately, hold down the Option-Command-P-R keys until your Mac restarts. When your Mac is starting up, release the keys.
4.Reinstall Mac OS X
If nothing above works, you may try this. Your Mac needs to be connected to the Internet. See number#2 above. Follow the same steps. Restart your Mac and hold down the Command key and the R key until the Apple icon appears; when you see the Mac OS X utilities window, select the Reinstall option.
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