Thanks.

Would a laptop running Ubuntu 12.04 count as a linux box?

And it now says somewhere that the card's corrupted.
And it loads to kdb, freezes, and the ACT light never comes on. :(

I managed to fix it by removing the power cable and plugging it back in. Any help for properly logging it off?

Right, so after a year behind my desktop computer I have dusted off my pi and got it to boot and output to a monitor. :) Unfortunately, when I logged it off, I closed lxde, then typed "shutdown" into the command line thingy. Using, what it said, I typed in sudo shutdown, then sudo shutdown now. It t...