It sounds like you may need to purchase a new power supply adapter for the Slingbox PRO-HD. The link below talks about issues with not connecting to the network, or resetting properly may be caused by a power supply failure. The article on this issue is linked below, and there is a link to purchase a new power supply for your Slingbox:
- Slingbox.com - Slingbox won't connect; won't reset; all lights on but network
- Slingbox.com - Buy Slingbox Accessories
Hope this helps,
I just plugged this in after a few years of not using it. The power light is on, but the network light is double-flashing every 30 seconds or so and the Sling Logo lights up with the first network flash and then slowly dims out. This repeats every 30 seconds or so. I have had it on for an hour doing this. The Slingbox is currently connected directly to the router, which I had reset back to factory settings. I also reset the Slingbox to factory settings. I have also tried using different network cables with the same results. When I reset the Slingbox, it does what it is supposed to do: I hold the reset button until the network LED blinks twice. After that, the streaming LED/Sling Logo and the network LED flash back and forth 3 times. Any suggestions on next steps?