Your description is a little vague, but it sounds like you need to get the Slingbox set back up, as you did mention you performed a factory reset on it. Let's first make sure the factory reset was done properly. Check out this article just to be sure:
After making sure it's been reset to factory settings, what you want to do is go to setup.slingbox.com using a computer that is connected to the same network as your Slingbox to run through the setup process.
Let me know if you run into any problems!