My iPhoto has become unreadable. How do I fix it?

My charger was breaking, so it would disconnect and reconnect to my computer a lot, which I think is why it stopped working. But now whenever I open it, it tells me to restart my computer to try to fix it, but it never connects to my pictures anymore. I can't even view my current ones on my computer, but they are still saved in my finder somewhere. I just want my iPhoto to work again. Any ideas?

Here's what it says:

Your photo library is either in use by another application or has become unreadable. Shut down and restart your computer, and then open iPhoto again. If the problem persists, try rebuilding your photo library. To do this, quit iPhoto, dn then reopen it while keeping the Option and Command keys pressed. You can also try restoring your photo library from a backup.

I have tried all of these things, and it hasn't worked at all. What do I do?