[ubuntu] disk won't start install process

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http://ubuntuforums.org – I have a Toshiba c855d-s5307 laptop. I redid a windows 8 installation and left 25GB free space to install 12.10 x64. secure boot is turned off and when I boot from the DVD I get the proper install/boot live options. But when I pick either one the disk spins for about 5 minutes then the screen shuts off and nothing happens until i restart. I've tried the USB live boot, but it will not start up either (Hardware)