Can't play left for dead 2, after upgrading to mountain lion to my MBPR 15"

Dear all the member in here.,
I upgraded my MBPR to mountain lion 10.8.2 in last two day. After i upgraded my machine. I can't play L4D2. Its open and splash screen appear, and then it goes to black screen. But, i can play L4D2 before i didnt upgrade. I dont know why. Please help me.

What does the Valve Software say about running L4D2 on OS X 10.8? Are there any patches/fixes?

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I can't get passed the complete installation
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all reference the "com.apple.garageband.plist" solution. I don't seem to have the referenced .plist.
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From the link to the Thread you provided, I worked through the one message procedures that were listed.
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"I've just installed one of these printers for my parents.
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(9) After that, you should be able to print to the ML-2525W whenever you want, without the printer going offline.
(10) If you have a USB printer queue still in your Print & Fax Preferences (from your previous unsuccessful attempt to connect via USB), you can delete it. You only need to keep the Bonjour queue.
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MacBook (white 12"), Mac OS X (10.6.5)

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Can't play left for dead 2, after upgrading to mountain lion to my MBPR 15"

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