A list of dumb things to check when troubleshooting computer problems from Tom Limoncelli, author of Time Management for System Administrators. A few examples:
- Make sure CapsLock is off. (Same for ScrollLock and NumLock)
- Are both ends of the (power/network/video/etc.) cable plugged in?
- Use cut-and-paste to copy that variable name to see if it was entered correctly.
Listen to an interview with Tom Limoncelli from the StackOverflow podcast.