won't boot , but failsafe does

[robotics56a]

I turned off my machine, and now it won't boot up. It gets to the point where it turns on the firewall then a x or hourglass appears then the screen goes blank after a few moments it appears and goes blank again. and the num lock led constanly blinks

pressing alt+ctrl+f1 or f2 don't seem to do anything.

but it does boot just fine in safe mode.

I can't remember if I installed any updates before I shut it down, it's possible.

10 points if you can tell me whats wrong with it. 100,000 points if you can tell me how to fix it. Thanks

[gogalthorp]

Do you have a Video driver?

Try reinstalling.

You may have had a Kernel update so you must reinstall the driver.

If you don't know how tell use you video card.

You could get back to a non-accelerated GUI by editing (as root) the /etc/X11/xorg.conf file and changing the driver to vesa

Then try to start the GUI with init 5

[robotics56a]

100,010 points for you!

I reinstalled the nvidia driver in failsafe mode and it worked perfect.