Yesterday my MacBook Pro started to be blocked.
When it boots it asks for the password for the Guest account. No password is right. According to various sources of information I found on the Web, this may mean that the computer has been locked from iCloud using "Find My iPhone".
From https://www.icloud.com/#find the Macbook seems to be blocked:
But there is no "unlock" button on iCloud:
When I click "Play Sound" a sound is effectively played by the Macbook:
"Find My iPhone" is not able to locate the computer's location, but it is here, on my desk!
When I power off the MacBook Pro something changes on https://www.icloud.com/#find and a button "Remove from Account" appears. After I clicked that button the MacBook Pro is removed from the device listing. But as soon as I reboot the Macbook will reappear in the listing.
I don't understand what is wrong: I own the computer, I own the iCloud/Apple ID account but I can neither use it, nor unlock it.
I tried to call Apple, today they won't respond (today it's Sunday, tomorrow is a holiday in my country.) I can't wait till tuesday.
Do you know how to solve my issue?