iMac (20 inch, early 2008) will not restart after that put 10.11.4 updated

Plug the iMac:

Processor: 2.4 GHz Intel Core 2 Duo

Memory: 4 GB 800 MHz DDR2 SDRAM

Graphics card: ATI Radeon HD 2400 XT 128 MB

After the download is finished installing, I clicked to restart.  When the computer restarts a gray screen with the Apple logo appears with a progress bar indicating "Installing Software Update".  The progress bar begins to move slowly and stops after about 1/8th of an inch.  It does not move little matter how long wait.  I tried to reboot safe mode, but I get the same thing.

I have really no idea what to do. I searched online and found several suggestions that go beyond my technical skills.

See if you can restore OS X by using the command + R key combination.

Instructions here > OS X: on OS X Recovery

Tags: Mac OS & System Software

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