My iMac screen have a gray veil. What is happen?

My iMac screen have a gray veil. What is happen?

Try a reboot.

Make a backup using Time Machine or a cloning program, to ensure that data files can be recovered. Two backups are better than one.

Try to set up another admin user account to see if the same problem persists. If back to my Mac is enabled in system preferences, the guest account will not work. The intention is to see if it is specific to an account or a system wide problem. This account can be deleted later.

Isolate a problem by using a different user account

If the problem is still there, try to start safe mode using your usual account.  Disconnect all devices except those necessary for the test. Shut down the computer and then put it up after a 10 second wait. Immediately after hearing the startup chime, hold down the SHIFT key and continue to hold it until the gray Apple icon and a progress bar appear. Startup is considerably slower than normal. This will reset some caches, forces a check for directory and disables all start-up and connection, among other things. When you restart normally, the initial restart may be slower than normal. If the system is operating normally, there may be 3rd party applications that pose a problem. Try to delete/disable the third-party applications after a reboot using the UN-Installer. For each disable/remove, you need to restart if you do them all at once.

Safe mode - on El Capitan

Start Mode without failure-El Capitan.

If it's the same in a new account and Safe Mode, if you live near an Apple Store, take a go-Genius Bar to have the test computer. Apparently there is no testing fees. Use the 2nd link if not near an Apple Store or are not in the United States.       Repair - the security of confidential data

Genius Bar réservation WE

Authorized service provider

Tags: Mac OS & System Software

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