HT204323: If a flashing question mark appears when you start your Mac

Learn about If a flashing question mark appears when you start your Mac
Bill Bay

Q: white screen on start up never shows anything

I never get past the white screen...no apple...

 

Tried command R same result.

 

Tried command cdsm same result...

 

CAN ANYONE HELP?

MacBook Pro, iOS 8.4.1

Posted on Aug 24, 2015 10:44 AM