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User profile for user: Ranjoharbri
Ranjoharbri Author
User level: Level 1
8 points

Grey lines appearing on monitor

Today I noticed that light coloured grey and white vertical 'Pinstripe' lines have appeared on the monitor of my Mid 2010 27 in iMac.
I have carried out a repair permissions through the disc utility, and attempted to run AHT from the original install disc.
As my superdrive no longer allows me to read DVD's I'm really stuck as to what could be causing these lines to appear.


Coupled to this the dreaded smudge marks that have reappeared on my monitor (even though it was replaced by Apple less than 3 months ago), I am now seriously considering throwing this machine away and buying a P.C.


Not to throw the baby out with the bathwater (so to speak). Does anyone on the forum have any idea how I can get rid of these annoying pinstripe lines. Is there a fix I don't know about.
Many thanks - A very disgruntled and about to become ex Apple iMac owner.

iMac (27-inch Mid 2010), OS X Mavericks (10.9.1)

Posted on Jan 14, 2014 9:33 AM

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User profile for user: rkaufmann87
rkaufmann87
User level: Level 10
140,556 points

Posted on Jan 14, 2014 9:38 AM

You will either need to get the Superdrive repaired or replaced in order to run AHT. You can get an external USB powered DVD drive and run AHT from that if you want. When you are able to run AHT run it in extended mode at least 2-3 times back to back. If any errors appear that means it has had a hardware failure. If no errors appear that only means the machine needs more robust testing, something the end user cannot do. You will need to take the machine to an Apple Store or AASP to be professionally diagnosed.


However I suspect your machine may be suffering from a failing graphics card.

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User profile for user: rkaufmann87
rkaufmann87
User level: Level 10
140,556 points

Jan 14, 2014 9:38 AM in response to Ranjoharbri

You will either need to get the Superdrive repaired or replaced in order to run AHT. You can get an external USB powered DVD drive and run AHT from that if you want. When you are able to run AHT run it in extended mode at least 2-3 times back to back. If any errors appear that means it has had a hardware failure. If no errors appear that only means the machine needs more robust testing, something the end user cannot do. You will need to take the machine to an Apple Store or AASP to be professionally diagnosed.


However I suspect your machine may be suffering from a failing graphics card.

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Grey lines appearing on monitor

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