flickering screen on startup after macOs Sierra upgrade

I have the same issue where the screen flickers on startup right about when the Apple logo comes up. I noticed that this is related to the resolution set on the MacBook. I don't see the issue on the default 1280X800 but the issue occurs on higher resolutions than that on my MacBook Pro.

Setting the resolution to something lower might help for now until they fix the issue.

Sorry for the delay as I was at work earlier. Ok I went to the display and not sure what you are talking about.

My display is set on 1280 x 800

Under Resolution is set on scaled

And I have a checkmark in the box that says automatically adjust brightness

That shouldn't matter. Can you click on the apple icon then "about this mac" and note the version number? Also, it would be helpful if you could click on the apple, then system preferences, then display and do a screen shot (command + shift + 3) and post your settings?

Seems like a lot of you are only experiencing this with Sierra. But I'm still running El Capitan and I'm suddenly now getting this very brief flickering on start-up. It's very short and it happens right when it switches from boot-screen to my desktop.

I've never seen this before and it just started doing it a couple of days ago. I use the 'more spaces' resolution and switching to default actually helped similar to what some of you've experienced. But it's kinda annoying since I don't want to run in default resolution.

Am I the only one experiencing this with El Capitan?

Dear all I need your help as i have a brand new macbook pro 2016 and after initializing from my time machine backup and updating sierra to latest version 10.12.3, it randomly happens that only the wallpaper / background flashes black for half a second, during normal usage, but pointer, opened windows, dock, etc... still remain displayed (i.e. No blacking).

Note that the screen resolution is set at default and that I do not remember to have ever seen a similar behaviour on my old macbook (sold in December 2016) even with sierra.

1- Has anyone remarked a similar behavior, please?

2- if it were a h/w problem, all the screen should flash black shouldn't it?

i am still in time for a return but since this is my second already (the first one having an evident uneven screen under white color) and, since it looks good, I want to be sure not to make a change for a s/w issue.

may you please advise about both points here above please?

thanks a lot

Emanuele

Exact same problem here with screen flicker at startup on El Capitan. I tracked it down to Spotify launching at startup. Auto-launch somehow got switched on within the app itself (advanced settings) and was messing with everything. I suspect there may be a host of different causes for everyone but fingers crossed this helps.

Gwen is your Air set to "more space"? Go to System Preferences-Display

Do you have your display scaled for "more space?"

I have the exact same problem. There's also a thread on Reddit with others having experiencing it too. https://www.reddit.com/r/MacOS/comments/53kdsi/graphical_glitches_on_scaled_disp lay/

I wouldn't worry, I'm almost certain it's software related. I had the problem with Sierra Beta, rolled back to Capitan and the problem was gone and then went to Sierra GM had the problem, rolled back and the problem was gone. Hopefully, they address it in an update.

I also have a similar issue, this happened every time I start my macbook after upgraded to Sierra...

My display was scaled for more space, changed to best for display and now it's a lot better...

This is a bug? Should I worry?

Same issue for me. On boot, the Apple logo will briefly blink red and then continue the boot. Just as the wallpaper comes up, the screen briefly flickers -- kind of a scary multi-colored something is wrong kinda flicker -- and then everything runs fine from there. My iMac is a stock 2105 21.5 Retina with the 2TB Fusion drive. No mods or upgrades. Not sure why this update to MacOS Sierra didn't go smoothly.