My HP inkjet printer has been sitting there since this weekend with a blinking red exclamation point on its control panel, and a little line circling around its LCD display. I've changed its ink cartridges, power-cycled it multiple times -- nothing worked.
Imagine my surprise, then, when I glanced at it this morning and saw that its front panel was all green and ready to go. I printed a page and it worked. Boggle.