Did you get your Sling Pro working yet ?
If not, check your power supply. Your description doesn't exactly fit the profile for a failed PS (many folks report intermittent or frequent connection drops along with dim LEDs on the Slingbox), but it's worth keeping in mind as you go through the troubleshooting process. Dead/dying power supplies tend to cause a number of bizarre problems.
This thread has the specs on your power supply:
Good luck ! If you solve the problem, post back and let us know how you fixed it.
Mine did the same thing. Worked fine. Last week stopped working altogether. First - no audio or video and stuck on optimizing. Now just sling mobile is doing that. Sling desktop gives me audio, and video is green with horizontal lines.
I hope someone figures out how to get it working again. I called up and they wanted to charge with the pay per incident.
I had to get a new slingbox - I spent countless hours trouble-shooting this on my own and with slingbox support and the final answer was that a new box was necessary.
Support incident will cost you $30, but they will take that off a refurb unit which normally runs $100, so will cost you $70. I just got my refurb unit, which works fine, and it comes with warranty (can't remember 30-90 days) so I updated the firmware right away and had no problems.
I had to talk to a supervisor, but some pro's did have issues, and they waived the cost of the refurb unit, although I still had to pay for the support incident.
Good luck - my opinion is don't waste as much time trouble-shooting this as I did - just get a new/refurb one.