By the sounds of it, the Slingbox does not have a network connection and it needs to be configured. Below will be a few articles that will be able to list some steps for you to take to resolve the blinking network light. Below is also an article that can further explain what the lights on the front of the Slingbox stand for.
- The Network light on your Slingbox blinks or turns off
- All about the lights on the front of the Slingbox
Sling Media Moderation Team