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Ashik, Mac Technician
Category: Mac
Satisfied Customers: 9774
Experience:  Bachelor of Computer Application (BCA), 9+ Years of Experience in troubleshooting Macs, iPhone, iPad, iPod etc
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just installed latest update and now after a short period screen

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just installed latest update and now after a short period screen goes black and won't come back on. any suggestions?
Hi I am Ashik. I think i can help you

Does your mac goes to sleep or does it completely turns off ?
Customer: replied 6 years ago.
I had to leave house for awhile. It seems like it goes to sleep, but I can't start it by pushing the mouse or keyboard.
Okay..try the following steps;

Reset PRAM and NVRAM
  1. Shut down your iMac
  2. Locate thfollowing keys on the keyboard: Command, Option, P, and R.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears and before the chime sound.
  5. Hold the keys down until the computer restarts and you hear the startup sound for three times.
  6. Release the keys.

Run Disk Utility from the Installation Disk

• Insert the Mac OS X Install/restore disc that came with your Mac, then restart the computer while holding the C key.
• When you see the Spinning gear, then release the C key
• Once on the Installer screen, select Utilities/Installer menu and choose Disk Utility.
• Click the First Aid tab and select the hard drive icon displaying your Macintosh HD
• Click Repair disk and Repair Permission. Disk Utility checks and repairs the disk.
• Once completed, quit Disk Utility
• Click on Installer Menu and reboot to your Mac Desktop

Best Regards,
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