Lion startup animation problem with auto graphic switching

After start OS X Lion, and after boot screen-  apples, flying/arrive background - animation, when I turned on the graphic card automatic switch(AGS) screen is stuned/freeze.. ... when I turn off this feature(AGS) if goes smoothly...
i have macbook pro 15" 2011  //clean instal lion from USB(appstrore version)
anyone have this problem?

Ale1199 wrote:
Ok, I've done it, but the situation is still the same, even though the last 3 or 4 times that I have rebooted the audio worked fine, but that could be a casuality.
Disconnect all external hardware (Walcom tablet for instance) and run through this list and stop after #16 and come back to report and/or proceed to #17 and further if it warrants it.
Step by Step to fix your Mac
There is a madness to the order of the steps, it's designed to narrow down your issue from hardware down to something lurking in your user account folder
So far I read the Walcom tablet is causing some issues, however that might not be the primary cause.

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