Greetings,
Looking at the post you mention old toad gave you steps to isolate out a potential issue with preference files. I'm assuming that you removed all the preferences and the same issue occurs?
If so do you get any kind of error message when you open iPhoto? If so please provide the details.
I'm also assuming you tried in a new user account on the computer and it worked fine correct? (just making sure)
Just for fun try going into Hard drive > Applications, and open up iPhoto from here while holding down the option key. Does it open?
_Unplug all external devices and test
_SafeBoot the computer and test iPhoto while in SafeBoot:
http://support.apple.com/kb/HT1455
__While in SafeBoot remove Your User > Library > Caches (the folder) to the trash
_Restart the computer
If the issue persists at this point:
_Go to Apple > System Preferences > Accounts > Login Items and remove all items from here using the minus sign except the iTunes Helper (anything else here was not added by Apple and may be interfering with iPhoto) and then restart the computer again.