Sounds like the power supply on the Slingbox might be marginal -- or failing. Any way that you can plug the Slingbox power supply into its own separate outlet?
If you unplug the new plasma TV altogether, does the Slingbox work again (looking here for possible RF interference or excessive current draw by the plasma TV cause a voltage drop on the line that it shares with the Slingbox.
Same exact thing.
I have been using my Slingbox HD for about 3 years with no issues. Last week I unplugged it for a couple minutes to dust the cabinet.
When I reconnected everything, the TV pass-through worked fine, but the network light stayed dark and the device was no longer visible on the network
The U is completely light and steady, the power light is on and the network light is dark.
Power supply issue? Sounds like a good candidate ... My Slingcatcher power supply died a month ago ...