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Helpful answers
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Oct 20, 2015 6:55 AM in response to shakenbakenycby dominic23,Finder > Application > Installer OS X El Capitan.app
Double click on it to start installation.
If this doesn’t help:
https://support.apple.com/en-us/HT203129
Right click on the Installer OS X ElCapitan and “Move to Trash”.
Empty the Trash.
Launch App Store, click “Purchases” tab and download OS X El Capitan again.
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Oct 20, 2015 7:04 AM in response to dominic23by shakenbakenyc,Thanks, Dominic. The problem is, I can't get to my desktop to click on anything. I'm stuck on a white screen with an apple in the center and (what I'm calling) the progress bar, at full, below it. Even when I manually shut down the computer via the power button, it returns to this screen.
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Oct 20, 2015 7:10 AM in response to shakenbakenycby Paul_31,Will the Mac start in Safe Mode? if it does, then try dominic23's suggestions.
Safe Boot: Restart holding down the Shift key until you see the Apple logo and then let it (hopefully) continue to boot, albeit more slowly than a 'normal' startup.
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Oct 20, 2015 7:11 AM in response to Paul_31by shakenbakenyc,Thanks, Paul. Alas, I tried safe mode and...same story (white-ish screen with apple in center and progress bar below it)!
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Oct 20, 2015 7:16 AM in response to shakenbakenycby Paul_31,This might help, and it'll do no harm to try if you haven't already - an SMC and PRAM reset: iMac SMC and PRAM reset
Do you have full backup to restore from if things get worse?
You could also try booting into the Recovery HD (if you haven't already tried it) and running Disk Utility to see if the HD needs repairs:
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Oct 20, 2015 7:35 AM in response to Paul_31by shakenbakenyc,Tried both SMC and PRAM -- still no go. I'm gonna look for my recovery disk. In the meantime, I'm still taking suggestions. Thanks all.