Jinkazama. Hopefully this is a minor issue. I've heard this happen before. Can't quite remember what the solution was, but it sounds like Grub might be corrupt or perhaps a modeset issue?.
First I've read somewhere that holding down shift during the first boot might fix the problem, so give that a quick try. (Not sure though) If that doesn't work.. I recommend, to use a LiveCD/USB version to boot from. That way you can ensure your drive is still intact, if you see everything then it should be a simple matter of fixing grub. (You can backup important files to another USB to be safe like docs, pics etc) If your installation is intact then try adding
to the grub file, "pico /etc/default/grub".. run "update-grub"
Assuming the Grub is corrupt, then
From the LiveCD/USB in a terminal window, go ahead and type "fdisk -l" to see your partitions. From there, mount the primary drive, example "mount /dev/sda2 /mnt". Install Grub, "grub-install --root-directory=/mnt /dev/sda" .. and finally update grub, "update-grub".. Then restart. Hopefully that will fix the issue.
Let us know