Bought a second hand Macbook Pro from a carboot sale, screens dead but i can use with a monitor or get repaired. Didnt pay much and its the i5, 8GB and 512gb SSD model so was worth it. Anyhow its got 2 accounts, 1 guest which i can use and another one which asks for an iCloud password which i dont have nor can get. Is it possible to remove this account and how would i go about it? Assuming iCloud works like how it does on phones, so even if i format it would still ask for password and i might loose the guest account too?