I am having the same issues - worked fine until recently - the network light is not on, the power light is on, slingbox symbol light remains solidly lit, and the internet connection is good with other equipment. I have tried reseting and swapping cables but still cannot connect to the network. Please let me know if you find an answer. Thanks!
If you are still experiencing issues with the network light of your Slingbox, please complete the troubleshooting guide from this link. That will help you with this situation.
I hope that works!
I tried all of the steps in the troubleshooting guide to no avail, except when I press and hold the reset button for 5 seconds or even longer, nothing happens. The box does not reset, the network light is still not on, and the Slingbox emblem remains lit constantly. My box is only two years old and I recently spent $30 on the ipad app. If I can't get this working it will be a huge waste of money.