screen turns off on boot

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http://askubuntu.com – So im dual booting windows 7 and ubuntu 11.10 using wubi, and when i turn on my computer it takes me to the boot manager screen and i pick ubuntu. After that it takes me to purple screen and askes me which version i want to boot (normal or safe mode) i pick normal. After i pick normal i get another purple screen and then my screen turns off and i cant see anything. Is there a code or command i can out in to keep my screen on/ (HowTos)