High Pitched Sound and now the hanging

Hi
Since I bought my Mac, it has from time to time generated a high pitched sound (just soft enough to not drive me totally crazy).
Recently I noticed that this sometimes goes together with my machine hanging. As soon as the sound stops then the hanging stops. It does not always hang when there is a sound, but there is always a sound when it hangs.
Is this something I need to get checked out? or is there something I can do about it?
Please help
Ronel
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 1 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version: 1.20f4
Serial Number: VM80695JX86

Hi, well my only thought is Back Up your HD..then visit/call AppleHelp or the Genius Bar/Apple Approved Service Agent...L

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