Clamshell mode won't work? (MacBook + LG Monitor)

Howdy!
I've triple-checked the official doc on how to use Clamshell Mode, but I can't seem to get it to work. My MacBook is plugged in and fully charged, the display (LG W2052TG) is connected, as are my USB keyboard and mouse. Yet when I close the display on my MacBook, it goes to sleep and will not wake back up. I've even kept trying for 5 minutes at one point.
I'm trying to avoid using InsomniaX (those warnings scare me)...

Are you sure you are waiting long enough? When I use clamshell mode it takes several seconds, perhaps as long as ten seconds before it works after I click the mouse. Try again, and wait a while before giving up.
Bob N.

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Shootist007 wrote:
Is this a brand new, less then a year old, MBP? If it is then take it to a Apple care center and have them look at it.
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Clamshell mode won't work? (MacBook + LG Monitor)

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