This sounds like the old failed keyboard issue. There is no disable feature since they design these things to require a keyboard. I GUESS you could unplug the keyboard. We have many Toshiba disassembly links over in the CNET Laptop Troubleshooting forum.
I have a toshiba portege r100 notebook computer. I have a problem on the keys, it keeps on entering 'S' and does not allow you to enter other key. If I connect a USB keyboard, it would allow me to enter other key, but still it does not stop from entering 's'. I already formatted the hard disk and installed a new windows xp. I am afraid that the problem is the hardware. Does it have a way to disable the keyboard so that I can just use my external keyboard?if yes how?
Thanks a lot