Mac Book Pro immediately goes back to sleep after waking under Lion

The sleep problem I am having seems to be in the minority, so I thought I would get it  (and the resolution) up here for others. I have a 2011 17" MBP.
The laptop wakes up as normal, and the display is active for 1.5 to 2 seconds before it shuts off again.During that time, the keyboard appears to be active, but even if you sucessfully log in, it will still continue to blink.
The trick that seems to work is to unplug the machine before waking it up. Under battery, the machine wakes up properly and you can plug it in again afterwards with out issue.

Would you create a new user account. Log into this account. Does the problem persist? If so, then navigate to the /Library/Preferences/SystemConfiguration/ folder. Remove the com.apple.PowerManagement.plist file. Restart the computer and reconfigure your Energy Saver preferences for both Power and Battery. Also, reset the SMC: Intel-based Macs: Resetting the System Management Controller (SMC). Test to see if this fixes the problem.

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