i photo problem

Hello:

When I want to look at some of the pictures in PHOTOs a picture will appear, then when I click on it, It goes away an the exclamtion mark comes up. What is going on.

Thank you.

Clair Zimmerman

Try here:
https://discussions.apple.com/thread/3830729?start=0&tstart=0

or here:
http://throwable.wordpress.com/2008/05/10/iphoto-shows-exclamation-mark/