First, it's important to understand that when you say "SlingStudio Wi-Fi" you could be talking about either of these two things:
Diagnosing an Internet connection problem
If you're trying to use the second type of network connection (a network that provides an Internet connection) but you're not able to make that work either via Wi-Fi or Ethernet cable, here are some things to look at.
Wi-Fi still doesn't work?
Check for proper SlingStudio unit operation
If you are still not able to connect to the Internet, please contact SlingStudio customer assistance.