How-to solve black screen on iMac with ATI Radeon HD 5700 video chipset and Ubuntu 12.04.3 LTS

After an Kernel update my alu iMac 27" running Ubuntu 12.04.3 LTS boots with a total black screen. Even the backlight from the video panel is off.

To solve this login in over ssh an edit the file /etc/default/grub

sudo vi /etc/default/grub

Find the line that start with GRUB_CMDLINE_LINUX_DEFAULT= and edit is to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"

Run update-grub and reboot

sudo  update-grub

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