Laptop makes buzzing noise on battery

Panasonic Toughbook CF-51 laptop.  The unit works well, however when running off the battery it makes a loud humming sound.  Any suggestions for how to reduce/eliminate this noise? Thank you!
Karalynn1958Asked:
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ee_autoCommented:
Question PAQ'd and stored in the solution database.
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Brad HoweDevOps ManagerCommented:
Stop you laptop. Remove the Battery and place it back in. Ensure that it is secured tight and all the contact are in place.
Check you power settings in the control panel and see if any settings are causing the cpu fans to run.
-Hades666
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Karalynn1958Author Commented:
I had already removed and replaced the laptop, had also tried another battery from a different CF-51, have cleaned the battery contacts with rubbing alcohol and have tried my power settings both on laptop and on max battery.
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nobusCommented:
a  humming sound comes from the battery?   strange, since it supplies only DC.
are you sure it does not come from the AC adapter?
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Karalynn1958Author Commented:
It only happens when the AC adapter is unplugged.  
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nobusCommented:
are there any vibrations?
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nobusCommented:
..good, good, good vibrations...
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asiduCommented:
>>It only happens when the AC adapter is unplugged<<
Inspect the DC jack contact.
Could it be due to a loose DC jack contact?

Noise probably coming from fan as suggested earlier by Hades666.

You have to open the machine and have a look at the mother board.
If the sound coming from a component it will be difficult to pinpoint.
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Karalynn1958Author Commented:
It ended up being an installation issue.  With a clean installation of windows the problem vanished.  I still don't really understand the source of the problem, but am happy to have it resolved.
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nobusCommented:
then close this Q please...
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Karalynn1958Author Commented:
Where should I write to get instructions on how to properly close my own question?  Srry, Kara
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nobusCommented:
in the help files - asking/closing Q
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