Black screen after usb installation of Ubuntu

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http://askubuntu.com – I just installed Ubuntu 12.04 LTS on my Toshiba Satellite A135-S7403 laptop using a flash drive. The installation went perfectly, I replaced Windows 7 with the ubuntu version and deleted all the old partitions on the hard drive. However, after being prompted to restart, all i get is a black screen with the flashing underscore after BIOS. I have an Intel Graphics Media Accelerator 950 for my graphics card. Please Help!! (HowTos)