Backup your data even if you aren't planning changes. The Cybergods are very sensitive to unbackedup data -- it offends them, and they enjoy destroying it.

Hit the save key (CTRL-S, or CMD-S) whenever you pause to think about what to say next.

If it doesn't work, check power first, and twice.

Always double-check the obvious when troubleshooting. Because 80% of problems are found in the first 20% of the checklist. I will never forget the gal who had startup problems because she had plugged a power strip into itself. (Well, it was plugged in, wasn't it?)

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