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
Code:
GRUB_CMDLINE_LINUX_DEFAULT="nomodeset acpi=force"
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