Consistent and very noticable tweeting noise

hey
there's a very noticeable/annoying tweeting noise coming from my mac mini (intel core solo/leopard). the only way to describe it is like a couple of mice/birds trapped inside.
it's been there a number of months. it starts after about half an hour of use although nothing seems to trigger it specifically. the mac mini is running really slowly in general.
i'm guessing its a hard drive problem rather than the fan.
since i cant afford to eat let alone buy a new computer. do i have any options ? is this a known problem ?
thanks
connor

Actually, it could be a fan problem.
Because if it is a fan problem, then the computer will overheat. Intel designed its chipsets to start shutting off cycles when the computer overheats. Basically a fail safe mechanism to keep it from burning up.
The fan could be broken, something in there isn't moving right, causing the tweeting. The fan could b spiining slow, Overheating the computer.
Download iCyclone, a free app, google search it. Monitor the temps when you are running the following app setups:
:Idle, nothing but the desktop (just the finder in the processes queue)
:Run the flurry screensaver for 5 minutes, then check the temp
:itunes
:itunes + safari
:itunes + safari + dashboard
:anything else graphic intensive up from there.
Your mini should never run above 100 degrees Celsius.
It will shut of usually at 110 degrees celsius.
Remember, these values are not in Fahrenheit. My mini will typically run up to 155 degrees F usually. Currently, with a few apps open, im running at 141.8 degrees Fahrenheit.
You can change the display in iCyclone from Fahrenheit to Celsius.
Let me know what you get.

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Failing Hard Drive Sounds http://datacent.com/hard_drive_sounds.php
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Consistent and very noticable tweeting noise

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