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Continous beep sound whilst working normally. How can I fix it?

When I am working normally on my Macbook for a few hours, it happens that a very high pitch sound appears. When I decrease the brightness of my screen, the noise stops, which is why I guess it is somehow linked to the screen. The noise is continious and really annoying, so I would really like to fix it.

I found a video of someone who has the same problem:

http://www.youtube.com/watch?v=PVpoJo2cc...

I should also mention, that it is not the harddrive as I changed and the problem still appears.

Answered! View the answer I have this problem too

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Try an SMC reset. Also is there a pattern to the beeps?

SMC reset for Mac laptops with non-removable batteries

These include MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).

• Shut down the computer.

• Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.

• On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.

• Release all the keys and the power button at the same time.

• Press the power button to turn on the computer. Note: The LED on the MagSafe power adapter doesn’t change states or temporarily turn-off when you reset the SMC.

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Or if the below solution did not solve your problem then try NVRAM effect power down the Mac hold down R OPTION AND P keys turn on Mac and as it is going to white screen hold down the shift key which is below the capital letter key on left hand side it will take you to safe mode this will clear the cache and hopefully solve your problem good luck

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