Interesting Sleep and Wake problem

For about a month I have found that the Macbook pro (2008) Osx10.7 doesn't seem to sleep when the cover closed with the power cord attached. The sleep light doesn't pulsate and it remains warm. When i open it up the log in screen flashes on, then the screen goes dark and I can't log in. I found myself doing forced restarts - then i disconnected the power cord and the log in screen magically reappeared.
It seems I need to disconnect the power cord wehn closing the lid, and if I forget to do that I need to disconnect when reopening the lid in order to log in.
I have tried resetting all the power settings to default, but it still does that.
Not a major problem, but puzzling.

The problem isn't so much that it won't sleep or wake. It does seem to do both more or less, but that if the power cord is connected it doesn't fully sleep (the LED doesn't blink) and that waking results in the login screen flashing on momentarily followed by a black screen which requires either a forced reboot or simply unplugging the power cord. Once the power cord is unplugged then logging in is easy as the screen recovers.
My question is why is this happening? Some new feature of lion? It has only been going on a few weeks.
It was quite troublesome until I figured out I could resolve the problem by unplugging the power cord, but I remain mystified as to why it happens.

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