It seems that you are having some issues with your Slingbox Classic since you are not able to get it up and running.
First, I recommend you to check the following link in order to know the compatibility of your Slingbox Classic.
In this case, I recommend you to reset your Slingbox Classic in order to set it up one more time for Internet Viewing. Just check this link and follow the included steps.
If you decide to get rid of your Slingbox Classic, I recommend you to take advantage of the Slingbox Upgrade Program. The following link will provide you with all the information about this option.