If you have a black screen, try pressing Alt+ ← and then Alt+ → to switch your tty, this may bring back the password query and turn backlight back on. In case you've installed Ubuntu with LUKS encryption / LVM option, it could be that Ubuntu just asks you for your password - and you cannot see it. If you are running Ubuntu 12.04 or 12.10, and have a ATI/AMD graphics card, you have to follow the instructions here, otherwise you will run into this problem every time you restart your computer.
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