I'm sorry, but you have got to do a lot better than that if you want assistance. We need to know things like:
Operating system
Version of Lightroom
Have you had Lightroom running previously?
When you talk about your library, are you talking about in the Lightroom library module?
In that module, do you see anything?
The more detailed you can provide about what is or is not happening, the more we will be able to help you.