Ubuntu 9.1 doesnt boot up. Grub rescue command

[adam123]

Greetings Ladies and Gentlemen:
I decided to install Ubuntu 9.1 on new system. I downloaded ISO file on hard drive and burned the image on CD. I run Ubuntu on new PC from CD without problems. Then I installed it on blank hard drive. Installation went without any problems. I removed a CD. Then I went for a restart. However Ubuntu doesnt boots up. Instead, I am in command line just after the boot up with the following message:
Crub loading.
error: out of disk.
grub rescue>

Note that my hard drive capacity is 325 GB. Ubuntu took about 4GB of space the rest is free space.
What I am doing wrong?
How do I fix it?
I can access hard drive and its contents from live CD.
I am completely a greenhorn on Linux. I appreciate your guidance.
Thank you for your time.
Adam:confused:

[dstew]

The most straightforward thing to do is re-install grub from a Live CD boot (https://help.ubuntu.com/community/Grub2#Reinstalling%20from%20LiveCD). It is possible -- maybe -- to re-configure grub from the grub-rescue prompt (https://help.ubuntu.com/community/Grub2#Rescue%20Mode), but it is a bit harder. If you want to try using the grub-rescue prompt, you will need to find the installed Ubuntu partition using the ls command, load the linux kernel using the linux command, and the initrd file using the initrd command. Then issue the boot command. If all goes well, and you have re-entered your hard-disk Ubuntu system, you can re-install grub permanently using sudo grub-install /dev/sda

[oldfred]

More info on solution to out of disk error:

http://sourceforge.net/apps/mediawiki/bootinfoscript/index.php?title=Boot_Problems:write