I found that while my downloaded USB's worked okay on my other computer (newer HP), they wouldn't boot the Toshiba. My own downloaded DVD's didn't work on either machine, so I think there was something wrong with my downloading. What did work was when I bought a Linux magazine "The Best of Linux" that had copies of 5 flavors of Linux: Fedora, Mint, OpenSUSE, Ubuntu, Magaeia, that my machine booted just fine and I was able to run them all. This was a live boot onto a Win98 computer.
When I ran the various systems I found that Mint worked perfectly and OpenSUSE worked very well (and I liked it better). I'll be running it live a few more times before deciding what to install. I'd prefer not to have a dual boot, since this is a really old laptop used mostly for internet while travelling (when we aren't using our new Ipads).