I had already set up my Slingbox (classic - PAL version) from a Windows PC using the Windows Slingplayer, but when I installed and started-up the Mac beta software (on my Intel Mac Mini, also within my home network) it found my Slingbox immediately.

I didn't need to (re-)do any setup of the Slingbox from the Mac, and I didn't have to enter Finder Id or the box's internal IP address or anything, it just found it immediately like my other Windows PCs on the home network did.

I'm not sure what advice to offer, other than to ask whether both lights are happily lit on the front of the Slingbox, and whether the Mac and Slingbox have both been given IP addresses on the same subnet of your LAN (if you can connect to your network router and view the addresses of connected devices you can verify this).

ted.h. 

I don't know about doing initial setup from a Mac, so I'll try to avoid taking you (and me) down a deep and unhelpful tunnel. Safest initial things for you to check (before anyone who has actually DONE a first-time setup from the Mac SlingPlayer jumps in to help):

* When you plugged in the ethernet cable from your Slingbox to your router (or switch or hub or whatever you have your networked devices hooked-up to) is the equivalent port on the front of the router lit?

* Are both green LEDs on the front panel of your Slingbox glowing green steadily (ie not blinking)?

If those are both good, then the Slingbox is probably connected correctly to your home network. Debugging what is going on beyond that is going to require either (or both) someone who has done a first-time setup of a Slingbox with the beta Mac client, and/or who can take you through the setup menus of your particular router device to see if there is anything configured in a Slingbox-unfriendly way.

ted.h. 

Something is not right, you should not have to enter any info. It seems like your Slingbox in not connected to the network. If your SB is connected to the network. The Finder ID and IP address should filled in automatically when you try to watch your SB.