It seems that you are having some issues with your Slingbox PRO-HD since you cannot reset the unit.
If you are not able to reset the Slingbox, this issue might be related to a faulty power adapter. I recommend you to give us a call as soon as possible in order to apply the required troubleshooting steps. These steps will allows us to determine if you own a faulty power adapter.
Just make sure to use the tools available on the right hand side of the screen.