[ubuntu] Black Screen After Selecting Ubuntu on GRUB

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http://ubuntuforums.org – I just installed Ubuntu 12.10 today. After I installed it it worked fine. I even restarted my computer, went to Windows 7, then came back and it still worked. Now when I select Ubuntu on GRUB my monitor gets no output, it's just black. My HDD light seems to do nothing too, or it just blinks at a steady rate. Is there something I can do in GRUB to fix this? (Hardware)