No sign of entry on the screen

Sound of my laptop was not working so I decided to update the software. Then it froze with the wheel of color and finally rebooted but froze again and no poster now a no sign of entry. What can I do? I tried to restart it and followed the different directions of the internet.

I recently had a similar problem and had a no sign of entry when I try to start my mac, I found it was to do with FileVault, the origin of the problem, I discovered this and it worked for me, it may be useful

Mac boots to no entry sign

This will help only if the problem is caused by FileVault.

To confirm that FileVault is the startup on cmd - r problem, select reinstall OS X, follow up when you select the drive to install the operating system. If it says "FileVault ongoing conversion.

Use the preferences window 'Security and privacy' to check the status of the conversion.

To fix

Close the device

'Shift' and press power once.

When charges Apple Logo appears let go 'Shift '.

This will start in the Mode without failure.

Go to; LaunchPad

Other

Terminal Server

In a Terminal type "sudo fdesetup disable.

Follow the instructions on the password and once it is said FileVault has been disabled.

Switch off the appliance.

You can try to restart normally, however most likely will have to restart under cmd - r and reinstall the OS.

These are deactivees FileVault.

Once the operating system is reinstalled the unit should operate normally and you can turn on FileVault return: settings, security and privacy, FileVault.

My guess is that this problem is caused when the device is not shutdown properly when encrypting files for the first time after installation.

Please Note * do this at your own risk of loss or corruption of data, data should not be affected by this, but there is a possibility.

Tags: Notebooks

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