I've seen this as well, usually accompanied with an error about the
"monitor is not getting along with your chromebook".

I also found that it was just on the login screen, and if I was able to
guess where to click to log in as the user, the issue would go away and the
chromebook would function normally.

The error made me think it was an issue with the hardware, or possibly the
background image being displayed. A reboot usually did fix it and I haven't
seen the issue resurface in a while. Very curious if anyone has any
information on it though.

On Tue, Dec 5, 2017 at 11:36 AM, Marion Bates <[log in to unmask]> wrote:

> Hi all,
> I work in a school that has a cart of CTL NL61 Chromebooks, bought last
> summer. Over the past couple or three weeks, teachers have been reporting
> that sometimes when the kids open the lid, it starts to boot/wake, but then
> instead of the normal login screen, it shows an odd pattern or tiling:
> [image: Inline image 1]
> (Note that the wifi, battery signal, etc. stuff in the lower right is
> displaying fine.) When this happens, there's no cursor or text visible.
> Clicking or mashing keys sometimes causes the tiles to shift around a bit.
> The only fix is to reboot the thing. It seems to affect any/all of them
> intermittently (18 total.) We're on version 62.0.3202.97 and we are using
> device management.
> Has anyone else noticed this? Maybe I should dump the custom background?
> <- I *think* that's what's being mis-displayed's supposed to be a
> lake scene with a reflection, but a bit less MOMA than this rendition.
> Thanks,
> -- MB
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Ms. Hadley Markoski
Network Administrator
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