Help!! Toshiba Tecra 8100 won't start Windows

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Can anyone help me?  I have a Toshiba Tecra 8100 with windows XP
installed, it worked great until I let my sister in law use it, she
dropped one of her school books right on the keyboard and now it won't
go to windows, when I turn it on it goes to a black screen that says
to choose amode to start windows, but I can never get passed that
screen, no matter which mode I select, it just stops.  Please help!  I
use that computer for work!! Thank you!

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