OSX Lion, Graphic Artifacts

Same problem here, I've had a lemon for awhile now that goes checkered with magenta/blue/yellow/green sqaures, I have a BTO mid 2010 iMac with an ATI Radeon HD 5750 1024 MB

I did a clean install, running Mavericks now. What helped initially was blowing out all the dust in side the iMac, take the glass bezel off. Things were good... and then become progressively worse. Probably heat related to all the firmware issues everyone speaks about. I also notice less issues if I just leave my screen running without sleeping.

Drive it until it blows up is what I say. That said, I had a question for gurus that know: what if hypothetically I buy a new Macbook Air. Could I use the mini display port on my iMac as a type of TDM thunderbolt display--bypassing this pixaleted mess?

milan.domeny wrote:

I dont thik it is hardware problem, becouse It never happend at Snow Leopard, only now at Lion..

Same with my Mid-2007 iMac. Upgraded to Mountain Lion (skipped Lion). This problem occurred almost straight away. Some updates to ML seemed to reduce the problem. At one point I thought it had gone away. But it came back. Not so bad though. Just certain apps like Safari.

The motherboard was replaced by my local Apple dealer with another salvaged from another machine (can't get hold of new ones because they aren't made anymore I was told). Result. Fine for a while but disappointing it has come back. Again only certain apps such as Safari. Otherwise now mostly okay.

So it can't be hardware. I'm thinking it might be Java.

I intend to repartition my external drive sometime so that I can use it for Time Machine but also have a boot partition with Snow Leopard on it. If I boot back into Snow Leapard and these artifacts don't reappear I will be sure to tell you all.

i have a macbook pro mid 2010 and i am experiencing rare sudden artifacts when using flash videos in youtube and other sites. Its like vertical black flashing lines. They appear for a second and then dissapear

This happens with various browsers (safari , chrome , mozilla etc.. )

i tested it with lion , mountain lion even maverics. I also tested it with MKV - MP4 Videos and games and it doesn't shows up.

I have to say that in maverics the problem reduced especialy in 10.9.2 but not gone away,

So to sum up after of months of testing i think that it's flash related problem. So i am waiting for a fix.

I have just installed Mavericks in it's own partition to try it out before I decide to commit fully to it. I was tempted by a reference somewhere that these glitching problems were sorted out by it.

Sadly I have to report these graphics glitches are there as bad as ever.

Flash you say. Hmm. I think I will try to find a way to disable Flash temporarily (or remove it entirely for a while) to see if doing so fixes these annoying glitches.

I find I only get them within windows for certain apps like the ones you mention, only now and then on my desktop itself. And its the window boundaries themselves as much as their content areas. WIth the content areas I can see the content by dragging a selection rectangle over it to reveal the text beneath. Google Earth gets riddled to blazes with them after having zoomed in the a great extent. Zoom out to a great altitude once more and the glitches go away.

Could Google Earth be the culprit?