12.10 Blank Boot Screen after Installing Over Windows 7

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http://askubuntu.com – So I am a first time Linux user, and wanted to install Ubuntu 12.10 on my laptop that was previously running Windows 7. I made a live USB drive to try it out, and then used it to go through the installation. (I wiped my old W7 install and replaced it with U12.10.) Everything completed fine, but now after my BIOS screen there's a blinking cursor for about 4 seconds and then nothing. Just a blank screen indefinitely. What am I doing wrong? (HowTos)