Chosen Solution
purchased of craigslistit worked then died and now a lock come on screen don’t no password
Pull one of the RAM sticks. On the first reboot reset the PRAM, here’s how: http://www.macworld.com/article/2881177/…
There are 2 possible solutions here . Contact the person you bought it from and ask for the password . or reformat it and load a new OS https://support.apple.com/en-ca/HT204904 Hope this helps
