[ubuntu] Boots in Command Screen

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http://ubuntuforums.org – Hey guys, I have a dual partitioned hard drive with win 7 and ubuntu 12.04. I am using an AMD Radeon 7850 graphics card and did not have trouble booting unbuntu until after I installed the latest update on from ubuntu on my computer. Now ubuntu starts out booting just fine but then the screen goes back and it enters the command screen. There is no option that I can find for actually booting my computer the rest of the way up. I have tried looking for the answer to this problem on previous people's threads but nothing seems to be working. What should I do? Thank for reading! You guys are awe (Hardware)