Help! MacBook fan keeps running after shutdown!

Twice since getting my MacBook a month ago, I've shut down the computer and put it in its carrying case, only to later notice it still emitting heat and its fan running a couple of hours later.
None of the power indicator lights is on. I could neither get it to start up or shut down (even after holding down the power button for over 5 seconds). The only way I could jolt it awake was to plug in its power adapter and then turn it on.
One random factor that I haven't willingly checked is that this may be happening when I close the screen immediately (1 second) after shutdown is complete. Maybe I'm jolting it before it completely shuts down?
Anyone else having this problem? And has anyone found a solution? I hope I don't have a dud here.
MacBook (Intel) Mac OS X (10.4.6)
MacBook (Intel) Mac OS X (10.4.6)

I've had this too.
You need to let it all shut down completely before you close the screen or move it. Don't just let the screen go black - you need to make sure everything has stoped moving etc. It seems to be a bit tempermental about this! Apparently it gets confused if you shut the lid too quickly and tries to sleep instead.
After making sure I shut down properly I haven't had the problem again.
Hope that helped.
Macbook 1.83GHz 1GB Mac OS X (10.4.7)

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Quit Safari if it’s running. Then select
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Move the following items from the open Library folder to the Desktop (again, some may not exist):
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Help! MacBook fan keeps running after shutdown!

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