|I'm not sure which key get's you into bios setup for Toshiba but since you've already tried DEL next try F1 and then F2 if that doesn't do it. (As far as I know, compaq is the only system that uses F10 to get into setup.)|
You can also try hitting PAUSE so it'll stop what it's doing and give you time to see the screen options.
Edit OK, it looks like on most of those you hold down the ESC key and then hit F1 so give that a try too. Here's some additional info:
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