Q: Why is my display screen all blue?

Hello sheepdogbrady,

After reviewing your post, it sounds like the computer is showing a blue screen. Is this happening a startup? I would recommend that you read these articles, they may be helpful in troubleshooting your issue.

Try safe mode if your Mac doesn't finish starting up - Apple Support

About the screens you see when your Mac starts up - Apple Support

The background at any stage of the startup process can be blue, black, or gray.

Thanks for using Apple Support Communities.
Have a nice day

Thank you for using the Apple Support Community. Due to the nature of your issue you may find more information by using another one of Apple's support resources - https://expresslane.apple.com/GetproductgroupList.action