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GNU GRUB version 1.99-21ubuntu3, DOES NOT WORK!
My computer boots to a black screen, what options do I have to fix it?

I have a Dell XPS 400, with a Pentium D 2.8 GHz processor, 3GB of RAM, and a ATI 5770 GPU. It has Windows 7 on it and I installed Ubuntu yesterday. It booted fine the first time, but today I left Windows 7 to boot into Ubuntu and all I get is a black screen with text reading:

GNU GRUB VERSION 1.99-21ubuntu3

minimal bash-like line editing is supported.for the first word,
tab lists possible command completions. anywhere else tab lists 
possible device or file completions

The only thing I did when I was in Ubuntu after I installed it was install an ATI graphics driver.

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marked as duplicate by Uri Herrera, Eliah Kagan, Jorge Castro, John S Gruber, izx Aug 23 '12 at 17:36

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Try reinstalling GRUB, as described here: askubuntu.com/questions/140785/…. –  Andrey Aug 12 '12 at 8:15
@UriHerrera This is actually a duplicate of the (or some) GRUB question--it's a grub rescue prompt, not a black screen. Usually reinstalling the GRUB2 boot loader to the Master Boot Record fixes this. –  Eliah Kagan Aug 12 '12 at 22:30
This answer should help you solve the problem. –  Aditya Feb 20 '13 at 12:53