Finder and Safari Not responding

Back up your Mac if you have not done so already. To learn how to do that please read https://www.apple.com/support/backup/. To learn how to use Time Machine read Use Time Machine to back up or restore your Mac. The reason for creating a backup is that the symptoms you describe could be indicative of an impending hard disk drive failure, so securing your data is a primary concern.

Then, shut down your Mac and restart it in "Safe Mode". To learn how to do that please read: Try safe mode if your Mac doesn't finish starting up. Compare how your Mac works in Safe Mode to how it has been.

Then, restart normally. If the same problem returns, please read the section If an issue doesn't happen in safe mode for Apple's recommended actions.

Finally, you can temporarily create a new User Account, and log in to that account to determine if the problem also exists when logged in to that Account. To learn how to do that read How to test an issue in another user account on your Mac. When you are finished troubleshooting, you can remove the temporary User Account by following these instructions: macOS Sierra: Delete a user or group. Before removing it, confirm you don't need any of the files you might have created in that Account.

Let me know what you determine.

Fix Sierra Installation

Try each of these in order. Test to see if the computer is working properly:

1. Reset the PRAM
2. Reset the System Management Controller (SMC)
3. Start the computer in Safe Mode, then restart normally. This is slower than a standard startup.
4. Repair the disk by booting the from the Recovery HD. Immediately after the chime hold down the Command and R keys until the Utility Menu appears. Choose Disk Utility and click on the Continue button. Select the indented (usually, Macintosh HD) volumeentry from the the side list. Click on the First Aid button in the toolbar. Wait for the Done button to appear. Quit Disk Utility and returnto the Utility Menu. Restart the computer from the Apple Menu.
5. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears select Reinstall OS X then click on the Continue button.
6. Reinstall OS X by booting from the Recovery HD using the Command and R keys. When the Utility Menu appears, select Disk Utility then click on the Continue button. Erase the startup drive. Upon completion quit Disk Utility. When the Utility Menu appears select Reinstall OS X then click on the Continue button.

Hi,

I have tried all the above mentioned methods, but failed. I was try to reinstall the OS, it was asking password to unlock Macintosh HD, I gave my user password. But it was not working. Is there anything that I can try to fix it?

I had the same problem on my late 2009 iMac. I tried everything. EVERYTHING.

• Reset SMC
• Run Etrecheck and clean up all the old "junk"
• Reinstall Sierra three times
• Boot in safe mode
• Delete Finder plist files

It came to the point that Finder was crashing every time my Mac woke up after sleep. The only thing that solved the problem was to do a full system restore from Time Machine back to El Capitan.