System clock is incorrect MacBook Pro
I haven't used my old MacBook Pro for over a year.
It runs, I think, El Capitan 10.11.
On startup it gives a message saying the system clock is incorrect, followed by email login errors, and then it freezes solid. The mouse moves on the screen but no menus work at all.
I've tried Recovery mode, which gets as far as the options screen and similarly freezes so I can't do anything.
There may be a DVD in the drive but holding down the trackpad on startup won't eject it, and I don't really think that's the cause of the trouble - it never gets as far as appearing on the desktop.
Does anyone have any (useful!) suggestions please?