A recent update causing macbook to become noisy

A recent software update from apple is causing my white 13 inch macbook to heat up and use the fan unnecessarily. I mean, I have no applications open and its heating up! What's going on? This only used to happen when I watched hd videos online. I can understand that. But now its occurring shortly after I start up the macbook with absolutely no applications running. Has this happened to anyone else after the latest snow leopard update?

recent update causing macbook to become noisy
Not standing on its power cord, by any chance!!??
Try resetting some of the hardware involved (PRAM~NVRAM). See this Apple KB for details, etc.:
http://support.apple.com/kb/HT1379
Can't hurt to try, and apparently this has helped others recently.
If still no joy, walk that little heat source into the nearest Apple Store and ask staff there for assistance, etc.

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