Pay careful attention: When you hear the Mac start-up sound as the computer gets ready to launch, hold down the Shift key. Wait until your Mac is completely turned off, then wait about 10 seconds and press the power button to start your computer up again.

You can also hold down the power button to force a shut down if necessary. To begin, go to the Apple Menu and select Shut Down. Safe mode allows you to open a limited version of the Mac OS X that can be very useful when locating problematic apps or other issues with your computer.

If restarting doesn’t work, try opening in safe mode to stop any annoying apps.

This will force the restart – just be sure that your programs are closed and your data saved before you attempt this. If this happens, press Control key-Command key (⌘) -Power button at the same time. Sometimes if Yosemite has really hit a wall this will freeze your computer instead of restarting it. Visit the Apple Menu (the button in the top left of your screen with the apple logo), and select the option Restart.

One of the easiest solutions for this problem is to fully reboot your computer and clear any current issues that Yosemite is experiencing.If Yosemite is already working on other updates or various ongoing processes, it may produce error messages instead of completing El Capitan. Remember that for a new download, especially a large one, Mac OS X needs to shut down various programs and processes. If you really want to like El Capitan but can’t actually complete the download due to error messages, your current version of Yosemite is probably causing trouble.Show 10 more items Problem: I tried to install El Capitan, but it gives me error messages Solution: Problem: I tried using Spotlight, and it’s not working right.Problem: I tried split view, but it won’t work.Problem: My printer isn’t working since El Capitan.Problem: My MacBook battery is dying easily ever since I installed El Capitan.Problem: Yosemite’s email isn’t working anymore.Problem: My Bluetooth has stopped working.

Problem: Ever since El Capitan, an app has stopped working entirely.Problem: My computer is running slowly when I launch an app.Problem: I tried to install El Capitan, but it gives me error messages.

Adobe reader for mac 10.11.1