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Hi Friends,
here same problem... look what Snow Leopard say to me:
screenshot20090830at193.jpg


if i un-plug the magsafe and plug-in, all work fine. I have this problem on a Macbook 2.4 ghz 4gb ram unibody , but also on the Mbp 2.4ghz 4gb 15" sometimes do the same.

I am wondering if is the case to bring my mb to an Apple Store... (btw this Saturday open here in italy a brand new Apple Store only 10 minutes far away from my home).
 
This actually happens to me several times a week. All I do is just disconnect, than reconnect the magsafe to the computer until the full brightness of the LED can be seen. It works every time for me.
 
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