MacBook Air Won't boot up
So I got a friend who said he bought this MacBook Air from somebody on Craigslist. He says that it won't start up. I told him to bring it to me and I would check it out.
When you turn it on the chime sounds and the grey screen comes up. After a couple of seconds a flashing question mark inside a folder icon shows up. Nothing else happens, it just keeps flashing.
I shut it down by holding down the power button and turned it back on, this time holding down the Command and R key. After doing this a grey login screen comes up with a padlock and blank field for you to enter a password of some kind.
I asked him for the password and he says he doesn't know it.
Anybody got any advice as to how to proceed?
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