IMac 27 "10.11.3 suddenly will not identify Icloud password

My computer was working perfectly until this morning, and it seems that a lot of my preferences have disappeared. The computer starts not in recovery mode or in safe mode. I can boot from an external drive for backup, but I want to reinstall El Capitan (sigh), but my password is not just recognized in the App store and I said 'contact support '. I have two other laptops that I could use with target mode, and all my files are backed up on an external drive and Dropbox. I have not done this for a long time and need some advice on how to reinstall El Capitan on my Imac. Have no idea how she became corrupt. The computer has a drive of Fusion and is around the age of 7 months. Have not contacted Applecare that I was not sure if they helped with a software problem.

Since it is under warranty, why don't look you at the Apple Store for repair. If the drive has failed, it will be replaced free of charge.

There are three ways to reinstall OS X. The first is to re - install on the existing system (must be the same version) which does not erase the drive. The second way erases the disk and reinstall the original version of OS X, which was preinstalled. This does not work if the computer came out before 2011. The third way is for the older pre-2011 machines on which you first need to install Snow Leopard after erasing the disc.

You don't have a Lion installed, as indicated in your profile if you have an iMac which is only 7 months old.


Reinstall El Capitan without erasing the drive

Make sure that you have a current backup before continuing.

HD recovery start:

Restart the computer after the ring, press in and hold the COMMAND and R keys until the menu screen to appear.

Repair

When the recovery menu appears, select disk utility and press the continue button. Disk utility charges and select Macintosh HD entry indented from the list on the left.  Click the first aid tab in the toolbar... If disk utility reports any errors that have been corrected, then re-run first aid until no errors are reported. Wait until the operation is complete, then quit disk utility and return to the main menu. Select restart from the Apple menu.

Reinstall OS X: Select reinstall OS X and click on the continue button.

Note : You will need an active Internet connection. I suggest to use Ethernet if possible because it's three times faster than Wi - Fi and more reliable.


Install or reinstall OS X from scratch

Make sure that you have backed up your files because the following procedure will remove all of the hard drive.

HD recovery start:

Restart the computer after the ring, press in and hold the COMMAND and R keys until the menu screen to appear.

Erase the drive:

1. select in the main menu disk utility and click on the continue button.

2. once the charges of THE select your boot volume (usually Macintosh HD) in the

list on the left. Click on the Erase tab in the main window of THE.

3. set the type of format Mac OS extended (journaled). If necessary, click

Security and button all the option data from scratch in a single pass. Click

the clear button and wait until the process is complete.

4 leave FROM 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 to use Ethernet if possible

because it is three times faster than wireless.

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

Tags: Mac OS & System Software

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