Can't get 12.10 to work

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http://askubuntu.com – My Toshiba laptop comes up with a blank screen after installing. I've run the diagnostic on it and get the following: fsck from util-linux 2.20.1 /dev/mapper/ubuntu-root: clean, 166118/4808704 files, 947684/19212288 blocks /dev/sda1 was not cleanly unmounted, check forced. /dev/sda1: 262/124496 files (1.9% non-contiguous), 44958/248832 blocks mountall: fsck/boot [445] terminated with status 1 Can anyone explain this. I can't re-install from the disk as I don't get an install menu any more. (HowTos)