Flashing grey question mark after iTunes update and restart?
I've just bought a 2008 Mac Pro EMC No:2138 running OS X El Capitan version 10.11.
It was working fine until it asked me if I wanted do upgrade to the newer version of iTunes. I accepted and then clicked on the "restart now" option to complete upgrade.
Upon restart the machine took me to the grey flashing question mark screen. I have tried all start up command combinations, none work except holding the option key which takes me to start up manager. I select desired disc and the screen turns grey, no flashing question mark just a grey screen. I have replaced the PRAM battery as I understand that it can cause boot up problems if it is dead.
Still no luck. Any ideas or suggestions would be much appreciated. Thanks
Is this a good question?