I seem to have lost my GRUB GUI upon start up. When I booted up in the past, I would be presented with a simple GUI that would allow me to arrow through a selection of OS's (well, really just one) and then select the OS to load. Yesterday, when I rebooted my laptop, I did not get the GUI but was brought to a grub> command line. I don't know how to load Ubuntu from here so my laptop, at the moment, is a very expensive paperweight.

Can anyone give me insight as to:
1) How to load Ubuntu from the GRUB command line?
2) Get my GRUB GUI back?

Thanks so much in advance