Blank White screen on startup iMacs running 10.11.4

[GabeShack]

In our library we have about 25 iMacs (21.5-inch, Mid 2011), that have recently started starting up randomly to white screens. What I've found is that the background is still the Login Window, because I can still type a username and password and it logs in, but its not showing the screen at all for some reason.

Anyone else seen this?

Gabe Shackney
Princeton Public Schools

[GabeShack]

Maybe same from this thread?
https://jamfnation.jamfsoftware.com/discussion.html?id=19626

[MrP]

I'd move everything in /Library/Launch/ somewhere else then see if you can make the whitescreen issue occur. If it doesn't, then it's a third party startup item that is causing the issue, not a management profile. Slowly add sets of them back into the appropriate folders until you cause the issue to occur again, narrowing in on the problematic plist.

[GabeShack]

No cause from the launch agents or damons. The only fix I find is by killing the plist for the login window. It's almost like this is getting corrupted.

Gabe Shackney

[rhoward]

Run in verbose mode and see what it's hanging on. I'm guessing (since it's a school) they have a configuration profile. There is a login window bug for configuration profiles currently (I can't remember what the number is off hand) which could be why you are having this problem. Also what version of the JSS?

[GabeShack]

I'm running the latest 9.91.

It looked like the issues with profiles stemmed around the security tab causing problems.

[GabeShack]

I'm seeing this again. Still no answers about what is happening.

Anyone have any thoughts?
Gabe Shackney
Princeton Public Schools

[mvu]

This isn't probably super helpful, but maybe it'll lead you somewhere.

When I saw this on my iMac labs (school environment), JAMF support told me to un-enroll a Mac or two. That worked. Obviously that wasn't the solution -- hopefully that does give you a nugget to go after since I couldn't figure out the problem.

• Macs were on 10.10
• We used configuration profiles • When I upgraded a Mac or two to 10.11, the problem went away

[GabeShack]

Im still at a standstill with this issue. And it keeps coming back. Im struggling to find the cause. So far my only option has been to revert back to 10.10 from 10.11. Id rather not have to do that.

Gabe Shackney
Princeton Public Schools

[GabeShack · Accepted solution]

10.12 doesn't seem to have this issue.

Gabe Shackney
Princeton Public Schools