My macbook pro screen freezes on apple and white screen upon opening.
I have tried a number of suggestions from Mac website.Reboot from button, or holding C, or holding Alt key on during start to kick the disc open.
I have managed to backup documents from drive using another mac to my mac.
Nothing is working.
Your computer's PRAM and the NVRAM are reset to the default values. The clock settings may be reset to a default date on some models.
Also try resetting the PMU by doing the following: