Why does the fan constantly run

my fan on my macbook pro is constantly running today? any answer as to why

Hi Julian,
MBPs run very warm. The fans run to cool the CPU etc. The warmer it gets on the outside, the harder it is to keep the inside cool. There can also be issues causing the MBP to run warmer than usual.

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If it seems abnormal, did you install anything new since it began?
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If you are still under warranty and/or have AppleCare, call them. Let them deal w/it.
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Hi,
My satellite A500 also acts like this, even if I surf the Internet, watching movie and CPU shows only 5%. I don't play games at all. It's not because of dust because I clean it regularly, installed all drivers, bios updated. Mostly, I run it in Power Saver mode but still makes noise.
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Hello Camille33,
Welcome to the HP Forums!
I understand your Photosmart 5520 runs a blank sheet of paper before you copy a document. I will do my best to assist you! Just to clarify are you printing a document from your computer or copying a document directly from your printer?
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Why would the fan on my macbook be constantly runs, even when no applications are running. Why?

Why would the fan on my MacBook constantly run? Even when I have no applications running? Is there a way to determine what is causing this to happen?

JAWade, try resetting the SMC and pram. Not always, but often those resets help problems like yours. Follow these instructions exactly.
To reset the SMC
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
Resetting PRAM and NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
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I have a Macbook Core Du0 1.83ghz running 10.6.3. Each time I watch a video on youtube or watching Flash or other multimedia animations, my fan run super fast.
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Does the fan on Macbooks with Nvidia Geforce graphic cards run less often?

Watching videos taxes the GPU and CPU. That's why the fan runs faster - to cool the computer. When you aren't doing much the fan slows down. This is true of all the laptops regardless of which GPU is involved.
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Hi-
Could a "Thermal Calibration" possibly correct the constant full fan speed issue?
Yes.
What software would be required?
The Apple Service Diagnostic disc (ASD) of the proper version for your machine.
Call an authorized Apple service provider and arrange a calibration, as the disc is not readily available to individuals.

Why does the fan constantly run

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