When I log in, regardless of whether I use the default client, Ender's, or Arksu's, the normal "Login" screen displays and allows me to click "login." Once I click "login", the game displays a message that says "Authenticating..." for several seconds, usually 5-10. Then the whole game window goes jet black instead of showing me the character selection screen.
I have run HnH on 3 other computers before, all running various versions of Windows (mostly Windows XP but one machine had Windows 7). This particular computer now is a machine running Windows Vista.
I no longer have access to the other machines (sadly) or I would just say 'O well, use one of the other computers'. There are NO ERROR MESSAGES displaying, or I would copy and paste those/print screen them.
I have the correct versions of the software (i.e. I'm running a 32bit OS with 32bit java and a 32 bit client) and at any rate that wouldn't explain the error with the default client anyway.
Anyone have some familiarity with this bug?
I saw one other post that mentioned a black screen at log in, but when I checked it out it said it had been moved to Wizard's Tower (wrong place for it as this is affecting default client too and is thus some kind of bug either on my end or on the server end (probably my end

Please, if there are any suggestions, I'm all ears (or eyes, as it were).
Since I assume it will be asked at some point, here's what I'm running:
HP Pavillion laptop with Windows Vista Home Premium 6.0, Build 6002
Intel Core2 CPU 1.66GHz
2046MB RAM
NVIDIA GeForce Go 7600 video card with 520MB Video RAM
Anyone think it might be video card related? But then why would login screen load and nothing else load? Ug. I just want to go back to enjoying my game.
Thanks for any help,
DS