I just purchased Half Life 2 from Steam on my Macbook Pro 13 inch. I installed Steam and now it is telling me that I am unable to connect to the Steam network. 'Offline Mode' is unavailable because there is no Steam login information stored on this computer. And it further says, you will not be able to use Steam until you can connect to the Steam network again. How do I go about doing this? I am confused about this situation and need some assistance... Thanks.