Hi all,
I have a 2017 27" 5k iMac that has started showing either a bright blue screen or a distorted screen after the computer has been asleep for some time. I will walk past my office and notice a bright light, and come in to find the bright blue screen or the screen shot I have attached here.
It only happens when the computer has gone to sleep and I will randomly find it like this. When I wake it the screen goes back to normal, which I have also attached as a screen shot. So, you can see that when the screen is acting up, it is like some sort of inverse of the screen that should be displayed.
At first, I thought this might somehow be my external HD causing this that I use for my TimeMachine backups. I think that drive is failing, as it has recently started taking a VERY long time to back things up, even when I have made extremely small changes on my computer. I unplugged the external HD and the problem has persisted.
The reason it makes me think it might be the GPU is because I had an iMac years ago that had the GPU fail and this is similar to what it did. The screen would become all distorted and the computer would lock-up. So far, I am only getting this one weird image or the bright blue screen. And, yes, it looks like the "blue screen on death" on Windows.
Any thoughts on this? Any tests I can do to see if the hardware is reporting any problems? I wanted to try something at home first before taking it to Apple.
Also, as I have typed this, it has also made me think through the problem more completely. When the computer is sitting asleep and it comes back on, I highly doubt the dedicated GPU would be activated, as it should only be using the integrated Intel graphics at that point. I haven't seen any issues when gaming on my iMac recently, which would be using the dedicated GPU.
Any thoughts would be appreciated!
I have a 2017 27" 5k iMac that has started showing either a bright blue screen or a distorted screen after the computer has been asleep for some time. I will walk past my office and notice a bright light, and come in to find the bright blue screen or the screen shot I have attached here.
It only happens when the computer has gone to sleep and I will randomly find it like this. When I wake it the screen goes back to normal, which I have also attached as a screen shot. So, you can see that when the screen is acting up, it is like some sort of inverse of the screen that should be displayed.
At first, I thought this might somehow be my external HD causing this that I use for my TimeMachine backups. I think that drive is failing, as it has recently started taking a VERY long time to back things up, even when I have made extremely small changes on my computer. I unplugged the external HD and the problem has persisted.
The reason it makes me think it might be the GPU is because I had an iMac years ago that had the GPU fail and this is similar to what it did. The screen would become all distorted and the computer would lock-up. So far, I am only getting this one weird image or the bright blue screen. And, yes, it looks like the "blue screen on death" on Windows.
Any thoughts on this? Any tests I can do to see if the hardware is reporting any problems? I wanted to try something at home first before taking it to Apple.
Also, as I have typed this, it has also made me think through the problem more completely. When the computer is sitting asleep and it comes back on, I highly doubt the dedicated GPU would be activated, as it should only be using the integrated Intel graphics at that point. I haven't seen any issues when gaming on my iMac recently, which would be using the dedicated GPU.
Any thoughts would be appreciated!
