I want to remove all of my photos out of iPhoto there are approximately 35000 some imported from an old hard drive and a SD Card from my Nikon D500 how do I do this

Question

I want to remove all of my photos out of iPhoto there are approximately 35000 some imported from an old hard drive and a SD Card from my Nikon D500 how do I do this?
I have iPhoto version 9.1.5 (615)
Mac OS X version 10.6.8
I want to do this because when I imported from my old hard drive there was an error message stating that 12 photos were not imported as the programm did not recognise the format even though they were jpegs like the other photos in that particular album. The dates of the photo folders are wrong I have multiple copies of photos and every time I start iPhoto I get the following message 12 photos have been found in the iPhoto library that were not imported would you like to import them No or Yes
if you press Yes the same message comes back again and if you press Yes again the program flicks to last import for 2 seconds and then opens events.
if you press No the message The photos have been placed in the folder/user/judith/pictures/iphoto Library recovered photos then if you press OK the original message 12 photos have been found.............
if you press No at this point the message The photos have been placed in the folder/user /judith/pictures/iphoto Library recovered photos_11 the end number goes up by 1 every time you go through this process
Any help would be greatly appreciated

Answer 1

Did you import an iPhoto Library from the old Hard Drive? Do you still have that old Library?
The way to clear out a Library is to Export the photos - Apps like iPhoto2Disk or PhotoShare will help you export to a Folder tree matching your Events.
For the annoying start-up message:
Go to your Pictures Folder and find the iPhoto Library there. Right (or Control-) Click on the icon and select 'Show Package Contents'. A finder window will open with the Library exposed.
Look there for a Folder called 'Import' or 'Importing'.
Drag it to the Desktop. *Make no other changes*.
Start iPhoto. Does that help?
If it does then look inside that folder on your desktop. Does it contain anything you want? If not you can trash the folder.