Due to the tangle of wires involved, I have been way too lazy to investigate why my lil headless, mouseless, keyboardless mac mini interwebs server went offline a week ago. First I had to collect monitor, then a corded mouse and keyboard, since I only have wireless ones sitting around these days. I really (no REALLY) was about to investigate this after watching the season finale of Doctor Who.
I flipped on the TiVo and was rudely informed that my programming data was down to a mere 3 days. Yikes. Oh Wait a minute. Maybe the ethernet hub slash wireless was acting up.

A quick cord unplug-replug and things were back in business.

In my defense, my wireless continued to work, while apparently the hub bit went offline. In any case, a simple fix.