My iMAC 27" suddenly displayed thick vertical green lines and then went to a whitish grey screen. any insight?

While accessing PAGES on my 27" iMAC computer, then screen suddenly displayed thick green vertical lines and then went to a whitish grey screen. Each time I shutdown and turn back on it shows the same thing and then goes to a blue screen. The last time I rebooted and I came to this site to try to problem solve. Any idea?

It sounds like a GPU problem, but I am not sure. Try booting in AHT (Apple Hardware Test) to be sure. Also, if you have another Apple computer, try to boot the other computer with the hard drive from the iMac using target disk mode. While booted on your imac's hard drive, check console for kernel panic logs. Paste only Kernel panic logs not application crash logs here please.

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Imac 21inch 2010 on boot vertical green lines then white screen ,will not load can anyone help please

imac 21inch 2010 on boot vertical green lines then white screen ,will not load can anyone help please

Howdy carliosa,
If your iMac is not starting up normally you may need to do some checking to make sure things are working correctly. I would suggest starting with the steps in this article -
Resolve startup issues and perform disk maintenance with Disk Utility and fsck - Apple Support
Thanks for using Apple Support Communities.
Best,
Brett L

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== This happened ==
Not sure how often
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Hello Ybakhat,
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
The computer sleeps or shuts down unexpectedly.
Best of luck,
Mario

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This happened the first time I started up the imac straight out of the box. The screen displays alternating light and dark grey bars with green pixel specs all over it. The apple symbol and and loading symbol are visible too - but it then goes to a light grey screen and freezes.
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I wouldn't try to solve this issue by troubleshooting a brand new machine. My personal policy is if an electronic device is malfunctioning out of the box, I return it for a replacement. We're talking about an expensive purchase and it should work, but even with stringent quality control a small number of products will fail out of the box. You didn't mention whether you ordered it online or purchased it at an Apple store. If you can, get a new machine at an Apple store and take advantage of the free setup. An Apple salesperson will start it in the store, so you'll know before leaving if it's good.

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Can anyone tell me why my 27" iMac displays vertical green lines when it is turned on and then will not boot up?

Welcome to Apple Support Communities
The display or graphic card are damaged. The only thing you can do is to take your computer to an Apple Store or reseller to get your computer repaired.
If you use an external display with your Mac, connect it to your computer and see if these lines appear on the external display. If so, it's a graphic card problem

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Hi
Not yet resolved it is erratic when it occurs but lasts for the session and is apparent in any graphics irrespective of application. I had a feeling it was a graphics card problem but may be wrong. I will have to try a stress test when I get chance.
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crw4096 wrote:
Is this a dead disk?
Very well could be.
If you can not startup from the Hardware Test, in Safe Mode or from > OS X Recovery as discribed in the Support article's.
Dig out the original Install Disc set that came with the iMac and do one of the following.
1. Attempt to Repair the Hard Drive.
Start from your Mac OS X Install disc: Insert the installation disc, then restart the computer while holding the C key.
When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
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 Mac OS X volume.
Click Repair. Disk Utility checks and repairs the disk.
2. Run the Hardware Test from the second Install Disc.
1. Insert Disc 2 and Startup holding the D key.
2. Select the Extended Hardware Test.
Then if you still can not get anything going, you need to contact your Local Apple Store or AASP and make a Service appointment.
see > Apple - Find Locations

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Could be the display or the video card. Sounds like something is temperature sensitive.
Blow out all the dust in your mac pro.
Reseat the video card.
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Hello,
I have a similar issue since this morning.... MacBook Air 13" C02GM1ASDJWV
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(Sorry for my bad English)
Hi all,
my laptop have a vertical green line on the right side of the screen.this line is visible in BIOS screen also. so i think it is a hardware related issue.but one good thing is that it is not visible in a white background.i don't know why;
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> Is there any thing i can do other than replacing the screen (i don't have any warranty on the LAPTOP )
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My iMAC 27" suddenly displayed thick vertical green lines and then went to a whitish grey screen. any insight?

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