You might try to set acpi=off in the boot command. That is the only way I can get the boot to work on a Toshiba Satellite A665D. On the live disk, there is a choice for "option" (I think it is F6) on the boot disk screen. Using this option, however, means that many things will not work properly, suspend, e.g. In fact, if this option works for you, I suggest that you do not install 10.10 until the problem is fixed.
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