How is your new computer hooed to your network? Is is hooked to the same router as the other slingbox working pc(s), or is there another router, hub, or bridge involved i the new computers connection?
If your connected wirelessly, are you connected to the same origional router or do you have a wirless bridge in play. Better yet, are you connected by chance to a neighbors wifi signal?
Also, on the new pc, I'm assuming you have already installed slingplayer?...? If not you need to do so; then then make sure it's on your firewall programs allowed list of programs/ports to work properly.
I'm having the same problem.
I have the green button and its says "Local Network (Available)" but it can't seem to find the player. I am able to view the SB over my Iphone but not on my PC.
My router says the Box is conntected.
I've tried all combinations of resetting, unpluging, etc the router, the SB, even my cable modem. None worked.