I have gray login screen and can't change it. It always was like bluer desktop background, but now just gray.
One time I made it normal with just changed background. Now it is not working.
MacBook Pro TouchBar and Touch ID, macOS High Sierra (10.13.2)
When FileVault is enabled, this is normal.
You have to login twice.
First login screen has a gray background.
Quoting from below linked support article.
"If you've enabled full disk encryption using FileVault, you're prompted to enter your user account name and password to unlock your startup disk."
https://support.apple.com/en-us/HT204156
When a user starts up a Mac in Safe Mode, screen flickering may occur. That is normal too.
When FileVault is enabled, this is normal.
You have to login twice.
First login screen has a gray background.
Quoting from below linked support article.
"If you've enabled full disk encryption using FileVault, you're prompted to enter your user account name and password to unlock your startup disk."
https://support.apple.com/en-us/HT204156
When a user starts up a Mac in Safe Mode, screen flickering may occur. That is normal too.
FileVault is enabled.
I started up in Safe Mode, but what I must find there?
When I used safe mode, I have some image errors.
I have restarted Mac again, tried to change background, but problem is still here.
FileVault had been enabled for 6 month, but this first happened only 3 days ago. If to be accurate, after I installed Duet (https://www.duetdisplay.com/). Can it be related?
When I Restart Mac there is a background image. But when I start it from Sleep Mode it is gray, despite it always was desktop background.
How could I know if I have full disk encryption?
Thank's for Safe Mode flickering.
Same exact thing happened to me. Its fine on startup then after sleep it's grey. Happen directly after installing Duet. Had been running High Sierra for about a month prior, and no FileVault enabled. Any fix ?
Got this from DUET team and totally solved it !
We’re really sorry for the trouble. Let us help you troubleshoot the issue.
2. Then, sync your iPad and powercycle it.
Powercycle:http://ipadpilotnews.com/2012/11/ipad-troubleshooting-tip-cycle-the-power/
3. Go to Duet’s icon on the menu bar > Click on the gear icon > Uninstall > Restart.
4. Then, please install the latest Duet Mac app:
https://slack-files.com/T03JN9WJD-F8PNVV3GT-9f405f13a2
Let us know if this works for you.
I am having this same problem. Lock screen is OK on boot up but goes grey after going to sleep.
Filevault is disabled but I had Duet installed before upgrading to High Sierra. I tried the post above with the latest version and no luck. I also tried just uninstalling Duet but the problem is still there.
Any other suggestions?
Do you have FileVault enabled?
Try starting up in Safe Mode.
Start up in Safe Mode. https://support.apple.com/en-us/HT201262
FileVault
https://support.apple.com/en-us/HT204837
SashaKry asked
How could I know if I have full disk encryption?
System Preferences > Security & Privacy > FileVault
Check the FileVault status
I am not familiar with with Duet Display. Sorry I cannot provide an answer.
This one works, thanks a lot!!
Gray Login Screen - High Sierra.
