Aperture import interrupted, now it crashes when opened

[Astral Cars]

I was importing some photos into Aperture when my battery unexpectedly died (that's a separate issue). I started the computer (a black MacBook) up again and opened Aperture only to have it be momentarily unresponsive followed endlessly by the rainbow spinning ball. Force quitting and restarting gives more of the same.

Any ideas on how I can make Aperture usable again? It's quite important to me.

For what it's worth, I'm running Aperture 2.1.4

 

[BobZune]

Open Aperture with CMD and OPTION keys pressed. For more, see http://support.apple.com/kb/HT2945. Good luck.