Click the window closed by clicking the small square at the top left hand side of the window. Try printing again. Check your power cable. Check your printer cables again and make sure it is firmly connected to both your printer and computer. After the Crash First, take a deep breath, and then relax.
Crashes are part of having a computer.
They still occur, of course, which is why we're talking about them here, perhaps as a reminder that nothing is perfect, not even a computer. Your Mac Restarting will shut down and then reset your computer system and any applications you are using, both of which could be the source of the crash. Restarting is often all you need to do to get yourself and your machine back into business. That will keep your extensions from loading as your computer restarts. If turning off extensions ends your crash-diving, then chances are an extension of some kind is your problem.