I turned on my macbook pro and ALL my libraries and albums are gone from iPhoto, any ideas

I turned on my macbook pro and ALL my libraries and albums are gone from iPhoto, any ideas
I already tried the hold down option command key and rebuild, didn't work
HELP PLEASE
no I do not have a bckup

Replay

What size if the Library as indicated in the Finder?  If it's large enough to be holding your photos then your photos are probably still in there but the library is damaged.  If the tags you used indicate iLife 11 then try the following:
Using iPhoto Library Manager  to Rebuild Your iPhoto Library
Download iPhoto Library Manager and launch.
Click on the Add Library button,                         
navigate to your Home/Pictures folder and select your iPhoto Library folder.
Now that the library is listed in the left hand pane of iPLM, click on your library and go to the Library ➙ Rebuild Library menu option             
In the next  window name the new library and select the location you want it to be placed.
Click on the Create button.
Note 1: 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.
Note 2:  your current library will be left untouched for further attempts at a fix if so desired.
If the above falils to recover your photos continue with this:
Starting over from scratch with new library
Start over with a new library and import the Originals (iPhoto 09 and earlier) or the Masters (iPhoto 11) folder from your original library as follows:
1. Open the library package like this.
2. Launch iPhoto with the Option key held down and, when asked, select the option to create a new library.
3. Drag the subfolders of the Originals (iPhoto 09 and earlier) or the Masters (iPhoto 11) folder from the open iPhoto Library package into the open iPhoto window a few at a time.
This will create a new library with the same Events (but not necessarily the same Event names) as the original library but will not keep the metadata, albums, books slideshows and other projects.
Note:  your current library will be left untouched for further attempts at a fix if so desired.
OT