i don't find my pictures!

Yikes, 20,000 photos & no backup!?

Forget iPhoto for a bit, look in your Pictures folder, what all is in there?

1 - With no backup you are 100% guarenteed to lose all of yoru photos sooner or later - this may have been the time

2 - what exactly does this mean and exactly what errore messages did yo rceive

Hi ! after installing iphoto version: 9.4.2(710.42), can’t find my over 20'000 photoes!!

3 - and exactly what did you do here - note that the latest version of iPhoto '11 is version 9.4.2 so you had the latest version of iPhoto '11

4 - Back up your iPhoto library, Depress and hold the option (alt) and command keys and launch iPhoto - rebuild your iPhoto library database

LN

The exclamation sign in the trangle

is an indication that iPhoto has broken the file path/link to the original file. Therefore apply the two fixes below in order as needed:

Fix #1

Launch iPhoto with the Command+Option keys held down and rebuild the library.

Since only one option can be run at a time start with Option #3, followed by #4 and then #1 as needed.

Fix #2

Using iPhoto Library Manager to Rebuild Your iPhoto Library

1 - download iPhoto Library Manager and launch.

2 - click on the Add Library button, navigate to your Home/Pictures folder and select your iPhoto Library folder.

3 - Now that the library is listed in the left hand pane of iPLM, click on your library and go to the File ➙ Rebuild Library menu option.

4 - In the next window name the new library and select the location you want it to be placed.

5 - Click on the Create button.

Note: This creates a new library based on the LIbraryData.xml file in the library and will recover Events, Albums, keywords, titles and comments. However, books, calendars, cards and slideshows will be lost. The original library will be left untouched for further attempts at fixing the problem or in case the rebuilt library is not satisfactory.

OT