Weird Retina iMac Graphics Glitch?

[Kritzmire]

Every time I see a thread like this I get scared for my soon-to-arrive RiMac...

 

[CuteBaby]

It happened again today....
Stayed for a minute and then did go away. called Apple support and they told me it is not a HD issue and performed SMC & PRAM resets and assured this will fix the issue for good.

Did you perform any custom RAM upgrades after receiving your iMac?

Also, do you have any peripherals (that did not come with the iMac itself) connected to it?

If so, have you tried disconnecting all such peripherals, and removing any custom RAM, to see if it makes any difference at all?

 

[natallica]

Just to update everyone. I have not seen the glitch since the one time, but I will definitely report back if I do.

 

[iczster]

Did you perform any custom RAM upgrades after receiving your iMac?

Also, do you have any peripherals (that did not come with the iMac itself) connected to it?

If so, have you tried disconnecting all such peripherals, and removing any custom RAM, to see if it makes any difference at all?

Hold up, I thought adding compatible RAM was perfectly supportable?

 

[CuteBaby]

Hold up, I thought adding compatible RAM was perfectly supportable?

It is supported, but the added RAM could be faulty.

 

[misho73]

Did you perform any custom RAM upgrades after receiving your iMac?

Also, do you have any peripherals (that did not come with the iMac itself) connected to it?

If so, have you tried disconnecting all such peripherals, and removing any custom RAM, to see if it makes any difference at all?

No custom RAM added. I have 16 GB Ram purchased with the computer.

Added peripherals are:
- Logitic mouse
- HP inkjet printer
- A secondary Screen (ASUS) connected through an HDMI to Thunderbolt cable.

Could it be the external monitor or cable? I noticed during the 2 times this happened the external monitor was attached. never had it when it was disconnected.

 

[natallica]

Mine came with RAM from Apple and have no external monitor. Again, hasn't happened since the one time.

 

[CuteBaby]

No custom RAM added. I have 16 GB Ram purchased with the computer.

Added peripherals are:
- Logitic mouse
- HP inkjet printer
- A secondary Screen (ASUS) connected through an HDMI to Thunderbolt cable.

Could it be the external monitor or cable? I noticed during the 2 times this happened the external monitor was attached. never had it when it was disconnected.

If it happens for a third time, try disconnecting the external monitor, then perform the PRAM reset again and see if the issue resurfaces afterwards while the external monitor remains disconnected.

 

[WilliamG]

I know this is not the same glitch (and I don't wish to hijack), but has anyone else noticed how when the screen goes to sleep and you wake the screen up later (i.e. not system sleep - just monitor going black/out), the way it brightens up when you press a key/move a mouse is not very smooth? I only notice it because it was super smooth on my 2012 iMac, but kind of... jerky on the 5K iMac.

 

[Korky]

Will defo keep an eye out for this and fingers crossed it's a Sw not Hw issue.

Out of interest as it's my first mac, how do I take a screenshot on it?

TIA

 

[touchUpInside]

how do I take a screenshot on it?

CMD + shift + 3
Take a screenshot on your Mac


.

 

[Korky]

CMD + shift + 3
Take a screenshot on your Mac


.

Thanking you very much....

 

[misho73]

It happened again today and stayed for half an hour. During this period even restarts didn't make it go away. Cleared out by itself later. Called apple support and they booked me an appointment with apple store on Sunday morning.
wish me luck ####

 

[WilliamG]

It happened again today and stayed for half an hour. During this period even restarts didn't make it go away. Cleared out by itself later. Called apple support and they booked me an appointment with apple store on Sunday morning.
wish me luck ####

Half an hour? Tell me you tried to take a screenshot?

 

[Michaelgtrusa]

Bad or overwhelmed GPU'S?

 

[misho73]

Half an hour? Tell me you tried to take a screenshot?

It doesn't show in the screen shot. But i took a photo with my phone please check my earlier replies

 

[misho73]

Mine came with RAM from Apple and have no external monitor. Again, hasn't happened since the one time.

Went to Apple store yesterday. the guy there did not even check the computer. One look to the picture i took with my phone and he told me that this is a defected LED/HW. And he issued a replacement case for me right away. and told me that he can fix it and replace the defected HW but this is a brand new Computer and it's unfair to rip it apart that early.
Called Apple online, I gave them the reference number and they issued a replacement.
Take take yours to the Genius bar and ask for a replacement. yours is a defected too and this defect will blow up at any time.
good luck

 

[iBighouse]

Which model did you get? I am planning on ordering mine tomorrow. I REALLY didn't like finding this thread!