Q: Screen stays black after returning from screensaver
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Nov 20, 2015 1:00 PMby norm123,Hey Man,
It sounds like you have a few things going with your iMac. Let's see if we can clear up issues with the screen saver and your slow startup times.
I would start with repairing the startup disk. You can do that by taking a look at the different options on how to do that. The best way would be starting up in OS X Recovery and use Disk Utility.
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
https://support.apple.com/en-us/HT203176
Another thing is that your startup disk may have changed. You can also try resetting the NVRAM to fix that plus other items that may be related. The next article wil help you out with that.
How to Reset NVRAM on your Mac
https://support.apple.com/en-us/HT204063
Take it easy -
Nov 24, 2015 6:14 AMby norm123,Hi Man,
Yes, you can reinstall OS X El Capitan while keeping the data in tact. All you need to do is restart your computer and hold the Command and R keys until you see a list of utilities that you can run. One of them will be reinstalling OS X. Click that and follow the steps and it will reinstall and preserve your files as well. I would also make sure that you back up before hand to ensure you have a safe copy of your data.
OS X El Capitan: Reinstall OS X
https://support.apple.com/kb/PH21976
Take care
