how do i verify my apple id on my macbook

Ive had the same macbook for 3 or 4 years now. The other day I restarted my computer and now cannot log into my apple id. Anytime I try to login to , iCloud it says that it cannot verify the identity of my MacBook.

The only suggestion its made is to restart my computer which I have with no luck.

Any help would be greatly appreciated!