Thanks for using our answers forums. Sorry to hear you are having issues with your power supply and connecting to the internet. It sounds like it may be the Slingbox itself at this point. You can try to purchase a brand new power supply from our website and see if that fixes the issue, but if that still gives the same issues, it would probably the Slingbox at that point. Below you will find links showing you where you can purchase a power supply and to our upgrade program where you can purchase a new Slingbox at a discounted price.
Hope this helps,
The Sling Moderation Team