• Is it plugged in?
• At both ends?
• Does the other end work with something else?
• Are all the power switches on? Including the one on the strip, the one on the back, and the one that’s not connected?
• Is DNS working?
• Are you out of disk space?
• Are you out of inodes?
• Where are the logs?
• What do the logs say?
• Have you ever gotten it to work before?

This entry brought to you by being out of disk space, a day after I asked for more disk space as a precautionary measure.