black screen when i reinstalled the os
I have a problem when i start the computer, the ventailator turn on correctly but i dont have display, i got a black screen with no sound during the boot. In a informaticien, he thinks it can be motherboard or bios or graphic id but he doesnt know repair it.
Can you please advice me on what i can do to fix it,
Many thanks in advance for your help.
MacBook Pro, OS X Yosemite (10.10.4)