get a better gpuseriously.
I just bought a new loving computer and I didn't have this issue with my older windows xp model.
I'm not trying to be mean, but its either the drivers or your GPU, what was your old computers GPU? Just because your current on is on a better OS doesn't mean its a better computer.
Well it so far runs better than my stuffty windows xp that took 5 loving minutes to warm up, additional 5 minutes to start up and laggy gameplay. I'm looking around and it seems like this black screen issue is a bug on valve's part.