HT201262: Try safe mode if your Mac doesn't finish starting up
Learn about Try safe mode if your Mac doesn't finish starting up
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Dec 13, 2013 5:23 AM in response to mememamatutuby a brody,Erasing is rarely necessary. It will make it obvious if you have hardware issues. Backing up at least to two different locations is essential before you attempt an erase. And frequently before attempting any analysis anyway as hardware issues with the hard drive can start as bad behavior and just get worse. So without knowing what's wrong, you might just be putting your head in the sand, and hoping for the best. So make sure you have at least two separate backups.