Black Screen after updating

If you get the Black Screen when booting-up the PC after updating the system...

1. Boot-up to the Grub menu. Please refer here on how to boot-up into the Grub menu.
2. Select the third line down. This is usually the second kernel. We are predicting that the problem is coming from the first kernel, so now we are opting for a problem-free boot-up by using the second kernel.
3. Remember the numbers in the first line on the Grub menu, as we will delete it later. For example 2.6.35-28 -- remember this number or write it down.
4. If you can boot-up using the second kernel, its means that the first kernel is the culprit that is giving you the Black Screen.
5. Go to System > Administration > Synaptic Package Manager.
6. Search for the term "linux-image".
7. Find the linux-image package with the Latest Version numbers as you've written down in the previous steps. Right-click > Mark for complete removal.
8. Find the linux-image-generic package with the same Latest Version numbers. Right-click > Mark for complete removal.
9. Make sure that the numbers in the Latest Version column are the same numbers as the numbers in the first line in the Grub menu. Otherwise the first line will still appear.
10. Click Apply then reboot your PC.

Done

Modified from here:

http://www.lockergnome.com/linux/2007/09/22/ubuntu-black-screen-recovery/

Grub Menu

1. If you only have 1 Operating System, Grub Menu will not be shown because it is turned off by default.
2. You can enter the Grub Menu by holding down the Shift button on your PC when boot-up.
3. If you want to turn on the Grub Menu, open your Terminal.
4. Type sudo su then press Enter.
5. Type sudo nano /etc/default/grub then press Enter.
6. Comment out "GRUB_HIDDEN_TIMEOUT=0" by putting # at the beginning of the line
7. Save it.
8. Recompile grub with the following command "sudo update-grub".
9. Reboot your PC.
10. You should see the Grub Menu on the next boot-up.

*Modified from here http://ubuntuforums.org/showthread.php?p=9982109