red & green lights go crazy on TH2G and blank screen

[nateman_doo]

I was trying to get Left 4 Dead to run, but when I run it the screens go blank. Then I hear the game running just fine in the background. I can slide my mouse around and hear the clicking of menu options like I am in the game, but no display. I looked down and didn't see a green light, but both red & green are on and it looks orange.

9800GTX+ SLI Nvidia drivers 197.45 (tried newest last night, still no luck)