High Pitched Chirping sound from within Mac Pro Case

Mac Pro Late 2008. Emits high pitched chirping sound for about one minute and then stops. Periodically comes back, then goes away.
Is this a warning of some kind? It's coming from within the case. It's not mechanical, it sounds like an alert. But nothing stops working and nothing has stopped working but it comes, it goes and then comes again.
Any ideas?

You say it's not mechanical, but it does sound like it could be a fan or drive bearing. Especially if you are in a warm environment.
Do you have external speakers connected or are you using your internal speaker?

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Quote from: flobelix on 12-January-13, 18:49:48
That is surely no typical problem of MSI mainboards. In fact that is very rare if it is the board.
Tke the board out of case on a non conductive surface with nothing else connected but but mainboard, ram, psu, cpu and vga. Try it again after clearing CMOS (>>Clear CMOS Guide<<)
If you are then 100% sure that it is the board this could be a defect as MSI mainbaords normally don't cause coil whine and I haven't heard that about 970A-G46 so far
I tried clearing CMOS by replacing jumper and loading factory defaults. Still high pitch sound is coming intermittently. As my 30 day period is over with Frys Electronics, How easy to get a replacement board from MSI. Does anyone know the steps?

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We bought the new 13" Aluminum Macbook today. In getting it set up there have been some periodic times where it started making a very high pitched whining sound that I could hear but my wife could not.
The ability to hear these high end sounds go away as you get older.
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Phil is right of course. You should send/take it back and get a new one.
Is the whine coming from the hard drive?
With the easy to replace hard drive in the new MacBook you can easily swap out the hard drive in your current unit with the new unit. That saves you reinstalling programs and transferring data. However with a whine I would be leery about keeping the same hard drive.

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This sounds like something similar to https://discussions.apple.com/thread/3388112?start=105&tstart=0.
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here's my plan.
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I just wish to check whether is it normal that there's high pitched beep (not very loud but can be heard in a quiet room) which seems to be from the LED or AC Adapter during sleep mode. The beep sounds continuous when the computer has been shut down or in off mode while the main plug of where the ac adapter is connected to is still on. Is this normal? My computer works fine. Battery is charging fine. I just want check whether is this normal. It is has been like that ever since I bought my computer on March 2012.
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Hello Huanwei,
It appears that you can hear a "high pitched beep" coming from the notebook while it's in sleep mode or even off, when the power adapter is plugged in and "on". I will try to help you with this.
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Thank you for posting on the HP Forums.
I worked on behalf of HP.

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Here is the bottom line.
You will only get 5.1 audio if the following conditions are true:
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-SC
Message was edited by: ScottishCaptain

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rfairley wrote:
...Can I simply shut off both machines and swap all of the drives in one for all of the drives in the other? I would keep them in the same bays in the machine I'm trading them with, but I'm unsure if I will screw something else up.
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Hi
I am currently using a Macbook Pro 15" retina display
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Greetings.
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High Pitched Chirping sound from within Mac Pro Case

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