Chosen Solution
MacBook Pro late 2011, suddenly doesn’t boot. Problem is: When I press power button I hear usual starting clicking noise and the sleep light lit for 1 second, and the screen stay blank. What I did… Remove second bank of RAM, Exchange Ram Stick, and Replace RAM. Remove Hard Disk (SSD) Remove all external wire connection to computer (USB, LAN, Charger …) Clean with compress air CPU Fans (Was clean) (Battery is fully charged) There is one time the screen Password Reset Screen appears, in upper left menu, I choose to reboot. Thanks for your help and advise.
