Grey screen of death and macOS update issue on MacBook
My MacBook has grey screen of death,also it is not updated and I can’t reinstall macOS. What should I do now?
[Re-Titled by Moderator]
You can get the exact model by entering the system serial number on the check coverage page (please don't post the serial number on the forum since it is considered personal information):
Check Your Service and Support Coverage - Apple Support
Also, what version of macOS were you using?
Here is an Apple article for various startup issues and screens you may see:
If your Mac doesn't start up all the way - Apple Support