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IMac comes up with wide vertical lines of static and then…

Customer Question
IMac comes up with...

IMac comes up with wide vertical lines of static and then goes to a white screen.

Technician's Assistant: Have you tried a PRAM reset on your iMac (rebooting and holding down Command, Option, P, and R)? Or rebooting in Recovery Mode (holding down Command and R)?

Still a white screen

Technician's Assistant: Anything else you want the Mac Expert to know before I connect you?

OS X utilities just came up but hard to read because of the vertical bars

Submitted: 7 months ago.Category: Mac
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Answered in 6 minutes by:
12/21/2017
Mac Support Specialist: Richard, Apple Software Engineer replied 7 months ago
Richard
Richard, Apple Software Engineer
Category: Mac
Satisfied Customers: 47,537
Experience: IT Engineer for over 15 years
Verified

Hi there and welcome

Power off the mac

Then start the Mac and hold down the Command and R keys at startup.

Hold these keys until the Apple logo appears. After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window

choose Disk Utility from the Utilities window, or from the Installer menu if you're started from an installation disc.

Click the First Aid tab.

Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.

Select your Startup Disk (usually named "Macintosh HD").

Click Repair. Disk Utility checks and repairs the disk.

Let this complete and when it has, tell me if you still have the problem please.

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