My Nikon camera won't take pictures. What do I do?

I bought a Nikon Coolplex L120 camera at Radioshack back in January. Around April/March, I noticed a small crack in the lens. I had a warenty, so I took it in to get it fixed. I didn't get it back until May…

Well, when I finally got it back, I took a few pictures.
Then I started having problems with the buttons… Now, I can turn it on, and do everything like normal, except take a picture!

I have no idea what to do, because I don't have the warenty anymore and I don't have the money to fix it. The problem is that when I go to take the picture, the shutter button just does not make the camera capture a picture… I can press it like normal, but nothing happens. ):

Help!

Added (1). Yes, I have an empty memory card in it (inserted correctly), and fully charged batteries.

Added (2). I can take video, change settings, zoom in, zoom out. Everything. Except take pictures

Does it have a memory card inserted and does it have any space? Many cameras will not take pictures if they do not have enough charge too

Have you contacted the repair facility and told them they did not repair it? Normally they provide a 90 day warranty on repairs. They should repair it regardless of whether it is still under warranty or not.