crwdns2933423:0crwdne2933423:0

Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

crwdns2934591:0566crwdne2934591:0 crwdns2934593:0crwdne2934593:0

Random triangles and flashing geometric shapes appear on screen ...

Suddenly, without warning or notice, my dear ole Mac has begun flipping out!

Parts of the screen will morph into perfectly shaped triangles or straight edge shapes which will flash, contort, pulse, etc. If I move the cursor to another place on the screen, the distorted portion of the display will change to a new location. As I type this now, the text will jump sideways then straighten back out. I have a screen video of the madness if that helps.

I have run the startup diagnostic tests and several virus scans. NADA!

This is a QT movie of the screen in action

crwdns2934081:0crwdne2934081:0 crwdns2934083:0crwdne2934083:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2944067:03crwdne2944067:0

Are you sure it didn't go to sleep?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Steve Job's ghost is haunting you ;-}

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

@gliittzer although I could never be sure, I don't think it is sleeping. Sleepwalking perhaps. Annoying as !&&* for sure. PHOTO BOOTH has an effect called PSYCHOTIC. That's my Mac right now. Psychotic. Job's, if your ghost has found my machine, I acknowledge its presence. Please send a ransom note ASAP as I am ready to put this behind me.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0

crwdns2933313:01crwdne2933313:0

crwdns2934051:0crwdne2934051:0

What does an external monitor show when this happens?

  • If its clean then it's your internal display having issues.
  • If it also shows the same problem then the logic board has a problem with the GPU logic.

Sadly both problems are expensive to fix.

crwdns2934105:0crwdne2934105:0

crwdns2889612:0crwdne2889612:0 1

crwdns2942205:01crwdne2942205:0:

I need to acquire a lightning bolt 2 adapter in order to check for external monitor condition. Meanwhile, I have noticed that when viewing youtube in full-screen mode there is not a problem. The glitch has an affinity for distorting the text I happen to be typing at any given time. Almost as if it knows exactly where my eyes are on this 27" piece of real estate it could be pestering... moving cursor does not stop it. rolling mouse wheel does.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0

crwdns2934229:0crwdne2934229:0

Stephen crwdns2934231:0crwdne2934231:0
crwdns2936625:0crwdne2936625:0:

crwdns2936751:024crwdne2936751:0 1

crwdns2936753:07crwdne2936753:0 16

crwdns2936753:030crwdne2936753:0 51

crwdns2942667:0crwdne2942667:0 2,055