Display/HD doesn't shut off

Hello all.
I bought a refurbished black Macbook, a couple of weeks ago, and am loving it. Unfortunatly, there is an intermitant problem with the display. When I close the Macbook, sometimes the display will not shut off, nor will the computer go into sleep mode. This is a waste of battery, and since I have to go longs periods during the day without recharging, it is quite annoying.
I was wondering if anyone had had this same problem, and if so, how did you fix it? Is there a sensor that may have gone bad? Thank
Macbook 13.3" black Mac OS X (10.4.6) Refurbished

The way the sleep switch works on the MacBook is that there is a magnet in the edge of the display bezel and a magnet sensitive switch located in the palmrest area above where the Kensington security port is located on the left edge (near the headphone jack). If you have any magnets on your refrigerator, go get one and you can see that if you place it on the edge of the palmrest area over the Kensington port, the mag switch will trigger and the Mac will go to sleep. At least it should. If yours doesn't, then there is something wrong.
The magnet in the lid may have shifted slightly and be out of alignment with the mag switch. If that is the case, it will probably have to go back to Apple for repair.

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