Backup
Backups are more than a good idea these days; they're a necessity. Whether it's photos and documents, or million-dollar databases, losing your data is never a good idea - especially when doing a backup is so simple.
I had a lot of problems getting my Linux box to use my S-Video connection as it's primary and only display adapter. First, it would POST (black and white only) then, when X started, it would just cut out signal entirely. I'm still not entirely sure why this ...
