fan huumming as loud as jet

Joined
Aug 12, 2008
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My hardware conf is

Machine Name: iMac G5
Machine Model: PowerMac8,2
CPU Type: PowerPC G5 (3.0)
Number Of CPUs: 1
CPU Speed: 1.8 GHz
L2 Cache (per CPU): 512 KB
Memory: 512 MB
Bus Speed: 600 MHz
Boot ROM Version: 5.2.5f1

now as soon as i start mac in just few seconds it starts fan on top speed which makes humming sound quite loud what should i do to stop this
 
Joined
Aug 16, 2008
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Check if there is a large amount of dust at the bottom.
I think that is what killed my mother board.
 

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