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I could use some help/advice on a problem I have with my iMac (late 2012 iMac running Mojave).
Recently, my iMac would not wake from sleep mode. After a hard shutdown, it took many hours (over 12?) to reboot and operated extremely slowly and again could not wake from sleep. I tried rebooting in Safe Mode (better, but still slow and then what?)and a PRAM reset. Running the disc utility repair option did not indicate any problems. I am able to boot up the computer from my SuperDuper backup on an external drive but unable to boot up from the internal hard drive.
Should I erase the hard drive and reinstall the OS? If I do this, can I reinstall the OS from the SuperDuper backup (or simply copy the external drive onto the hard drive?). Any other ideas or options? I'm far from an expert on Macs and the idea of erasing the hard drive makes me nervous but I'm not sure what else I can do. Any advice is welcome - Thank you!
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