I tried to install Ubuntu to an external hard drive (WD My Book Essential 1.5TB). The live CD loaded fine, and I choose custom install. I made 2 primary partitions for
Boot(/boot) and a logical partition for the swap space. I'm pretty sure I installed GRUB into the external drive. I then booted into windows 7 and configured the rest of the space left on the drive as an NTFS partition to later backup my Windows 7.
However, when I tried to boot Ubuntu from the external drive I got a black screen with green lines going down. In the green lines were (what looked like) percentage signs. I assume this is fairly rare because its never happened to me before. My computer wouldn't do anything from there, and I had to force shut-down. This happened twice, and then I went back to Windows. The NTFS partition still works fine, so I doubt its the drive.
Does anyone know what I can do to fix this or what mistakes I may have made during installation? Any help would be appreciated. Thanks
Edit: I got it so that the screwed up screen is gone but now it's just a blank black screen and no boot. Also, I tried using the GRUB menu, but it doesn't seem to want to come up no matter what I do or what keys I press. Could it be a problem with the location GRUB is installed to?