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User profile for user: lucafromcastiadas
lucafromcastiadas Author
User level: Level 1
0 points

when i start my iMac, white strings appear in monitor

Hi, today i have boot my iMac and i have find my mac with white strings in monitor, i think it's driver issue, see the picture:


http://casulasoft.it/IMG_2256.JPG

http://casulasoft.it/IMG_2256.JPG


i can't use the mac because when must appear login window my iMac restart automatically


it is not the first time.. but the first time i've fixed it with pram reset.. now it's does not work.

iMac, OS X Mountain Lion (10.8.5)

Posted on Oct 20, 2013 8:22 AM

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2 replies
User profile for user: mario49
mario49
User level: Community Specialist

Oct 23, 2013 1:36 PM in response to lucafromcastiadas

Hello lucafromcastiadas,


Thanks for using Apple Support Communities.

For more information on this, take a look at:


Intel-based Macs: Resetting the System Management Controller (SMC)

http://support.apple.com/kb/HT3964


About NVRAM and PRAM

http://support.apple.com/kb/HT1379


Resetting NVRAM / PRAM

  1. Shut down your Mac.
  2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
  3. Turn on the computer.
  4. Press and hold the Command-Option-P-R keys before the gray screen appears.
  5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
  6. Release the keys.



Best of luck,

Mario

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when i start my iMac, white strings appear in monitor

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