Installed is El Capitan can not shut down computer

Press and hold down the Power button until the computer shuts down. Wait about one minute. Then do the following;

Try these in order testing your system after each to see if it's back to normal:

1. a. Resetting your Mac's PRAM and NVRAM

b. Intel-based Macs: Resetting the System Management Controller (SMC)

2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:

Boot to the Recovery HD: Restart the computer and after the chime press and hold down the

COMMAND and R keys until the Utilities menu screen appears. This will be slower than a normal

startup.

3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.

When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the

indented Macintosh HDentry from the the left side list. Click on the First Aid button in the toolbar. Wait until the operation

completes, then quit Disk Utility and returnto the main menu.

4. Reinstall OS X: Reboot from the Recovery HD. Select Reinstall OS X from the Utilities menu, and click on the Continue button.

Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

The Console application in your Utilities folder may provide some information about what happened when you opened the application, then tried to shutdown. Note the time at which you made this experiment, then look at the console messages a little before and after. See if there may be a clue as to what is happening. Also, does this happen with any application or just one particular one? Also, see App Compatibility Table - RoaringApps. Be sure your applications are up to date.

If nothing is fixing the problem then consider erasing the drive and re-installing OS X and your applications from scratch. See Basic Steps for Upgrading OS X.

Install or Reinstall OS X from Scratch

Be sure you have backed up your files because the following procedure will remove everything from the hard drive.

Boot to the Recovery HD:

Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears.

Erase the hard drive:

1. Select Disk Utility from the main menu and click on the Continue button.

2. After DU loads select your startup volume (usually Macintosh HD) from the

left side list. Click on the Erase tab in the DU main window.

3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on

the Security button and set the Zero Data option to one-pass. Click on

the Erase button and wait until the process has completed.

4. Quit DU and return to the main menu.

Reinstall OS X: Select Reinstall OS X and click on the Install button.

Note: You will need an active Internet connection. I suggest using Ethernet if possible

because it is three times faster than wireless.

This should install the version of OS X that you had installed.

Hello,

I was having a simillar problem after upgrading to El Capitan

When I logged as my self (administrator) I could not shut down at all, finder would not respond, but all other aplications would work.

Couriosly, if I logged as guest or made a safe boot (turn on while pressing shift) this would not happen.

After many tries, I found out that a specif program called "AirDisplay" was causing that because it was automatically oppening from the start up.

I unistalled the program and it resolved my problem.

Maybe you have a similar app that is not compatible with El Capitan...

Felipe

Hi I'm having the same problem where is airdisplay located and can i just eliminate this one program?

Air Display is not a native program.

Open Finder > Aplication and search for the app. Than just send to trash.

Hi I did not find airdisplay, but it got me thinking about other programs that might be causing the problem. I eliminated Cisco Anyconnect and Microsoft Lync and now it seems to be working better. I am also going through and eliminating things I no longer use from the library. I am relatively new to the MAC, about 18 months, things I knew how to do in Windows are different and unfortunately this is helping me learn the MAC a little deeper.