I've got a halo around the outer edge of my retina MacBook pro screen, how do I get it to go away?

Ksave wrote:

Ive been using my MacBook flawlessly for a while, today when I tried to start it up it just stayed on a block screen. I did a hard reset then when it came back on it had a halo around the outer edge of my display, how do i get rid of the halo?

I am not sure what is a "block Screen" ?

To trouble shoot further you can:

—Try a SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc.

Login and test. Reboot as normal and test. Caches get rebuilt automatically.

In Safe mode third party system modifications and system accelerations are disabled, it removes malware, etc hampering smooth operation, however a reboot will put it back to normal mode.

This test will tell you if third party interference; extensions etc are not loaded in safe boot mode.

—Test issue in another user (or guest user) account https://support.apple.com/guide/mac-help/set-up-other-users-on-your-mac-mtusr001/mac

This will tell you if it a universal issue or isolated to your user/admin account. 

Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus

Ksave wrote:

black screen sorry

If your Mac starts up to a blank screen (white, black, gray, or blue)

https://support.apple.com/en-us/HT210905