macOS Catalina Blue Screen after update during inactivity

Did they do a screen share with you?

If not, call them again! https://support.apple.com/en-gb/mac/imac

Let an agent SEE your blue screen!

Did you already try starting in Safe Boot mode? (Pressing the shift key when you start your computer)

Good luck. Please report back to this thread. Thanks.

Apple Care said the developers don't address issues like this from this public discussion thread. I tried to share a link to this thread but they didn't want it.

They said report the problem here:

https://www.apple.com/feedback/

I don't use any sort of wall paper app or anything and my iMac has been doing it as well since the update. The screen is a bright blue and does not go away unless I wake the computer. If I put the computer to sleep, it will go black initially but then 5-10 minutes later the blue screen comes back. I worry it will hurt the monitor because it is a very very bright blue, across the entire display, and does not go away. It sits like that overnight. While I wait for a fix, should I be worried about my monitor? Should I shut it down at night?

Latest update didn't solve (see pic).

Report the problem here so they see many people have the same issue:

https://www.apple.com/feedback/

I am getting blue screen too. 3rd time since Catalina update. Today is 10-21-2019.

It happens when the iMac is inactive. Instead of going into sleep / screensaver mode it is a distorted color or solid blue. See image.

I contacted Apple Care and they do not have a remedy but trouble shooting procedures.

How does apple gather these symptoms to fix?

I have a new MAC desktop with Catalina 10.15.1 running on it - and I'm getting the same problem: When the machine goes to sleep it switches to a solid blue screen. It wakes up just fine, but when it goes back to sleep, the blue screen appears at some point later. No special apps running. I'm getting very discouraged from this Catalina update... never in my long history of owning Apple products have I had so many bugs hit my Apple computers (laptop and workstations) at one time.

I bought this adapter and replaced my old one and since then it works fine.

USB Type C(Thunderbolt 3) to DVI Adapter, Benfei USB 3.1 (USB-C) to DVI-D Adapter Male to Female Converter Compatible for Apple New MacBook [2015,2016,2017] https://www.amazon.com/dp/B0768RFQ83/ref=cm_sw_r_cp_api_i_kdGZDb86SAGDR

I am getting the blue screen on iMac but not only...

It started with blinking every now and then on fullscreen mode video,

Then when i try to go on Apple Support online, it says forbidden 403.

What is happening? i don't have any malwares, i scanned it just now.

And i can't even get help.

I bought my new iMac in September 2019 with Mojave, and upgraded to Catalina two weeks ago.

Normally when I do Apple -> Sleep the screen goes black and stays that way. Three times in the past two weeks the screen turned black as usual, then a few minutes later it turned BLUE.

It performs A-Okay; this weird, occasional blue screen is the only problem I have. I can live with it, but if it is fixable I would like to know!

FWIW: plugged into the iMac is a USB Apple keyboard, a USB Logitech mouse (very basic, not a gaming mouse), and a USB Canon inkjet printer (which is always turned off when I put iMac to sleep.)

I got a new adapter. Mine is good now.

Thanks for the validation. I’ll do that.

Martina,

Thanks for your help with those that have an external monitor.

My computer does not use an adapter as it is an iMac.

John