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Right when it should finish loading all I see is a black screen right before the game crashes. This only happens on biodome for whatever reason.
Uninstall NS2 and delete the NS2 folder in C:\Program Files (x86)\Steam\steamapps\common. Re Download and install the game. If the problem continues email tech support and they can help you.
I had this same problem happen to me not long ago. Uninstall NS2 and delete the NS2 folder in C:\Program Files (x86)\Steam\steamapps\common. Re Download and install the game. Hopefully this will have you playing again.