Q: Black screen after security update download

I have the same problem... Any solution?

Same update, same OS version, same day... Sounds like an update bug.

I thought it was a hardware problem of my machine but if we are many people with the same problem, I doubt it.

Trying to recover OS X Mavericks installation...

Recovery mode (Command-R on boot) > Reinstall OS X

Remaining time: 2 hours...

I will let you know if it solves the problem.

Reinstalling doesn't solve the problem

Same thing happened to me........ Updated my iMac to 10.9.2 overnight and I have a black screen this morning.  Rebooting does nothing...... Ugh!  Wanna scream!  I need to get this computer working today.  Please does anyone have a suggestion?

Same exact problem this morning. Can't be a coincidence, must be the update.

Is it booting into Single User Mode?

Startup - Black Screen/White Text

Startup Issues - Resolve

Startup Issues - Resolve (2)

Just black screen.  The mouse cursor is visible. That's all.......

Same here. Can force it to come up in single user mode but that's not what it naturally does. Rebooting from single user screen does not work.

This happens to me as well.  Apple support directed me to reinstall Operating System.

Apple Support recomended taking into service center.  The re-install did not fix the problem. :-(

It sounds like a corrupted OS update.

Had this and managed to fix it.

Boot the unit, holding the shift key, as though you're booting to safe mode.

When it gets to the black screen and your cursor, type the first letter of the username, press the Tab key, and then type in your full password, and press enter.

You'll get the spinning beach ball, and after a while you should get a Mavericks loading Window, with an updating loading bar. Let it go through and it should get to your desktop fine.

Restart you machine and then you should be good to go.