iMac FAN noise !

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I have 24" iMac. When I bought it (4 months ago), fan was very silent, but yesterday when I switched my iMac on, it started very loud. I downloaded istat menu utility to check fan speeds, it shows:

CPU FAN: 3295
HARD DRIVE: 5498
OPTICAL DRIVE: 4401

cpu temperature always shows 25 C

I am only running safari, how can I decrease fan speed ? please help
 
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Aug 20, 2008
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Your Mac's Specs
2.8 GHz Intel Core Duo Extreme, 2GB 667 MHz DDR2 SDRAM
I wouldn't know. Im new to MAC as well. I will give you my stats
CPU FAN: 1199rpm
Hard Drive: 1373rpm
Optical Drive: 698rpm

Picture 1.png
 
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Leicester, England
Your Mac's Specs
MacBook, iPod Classic, 8GB 3G iPhone, Time Capsule
Rather than focusing on reducing the speeds, if it doesn't slow down to me that says there's a problem because it's not adjusting the speed itself. You're still under warranty, so I'd get in touch with Apple.

Have you tried the usual restart?
 
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Your Mac's Specs
Al iMac 20" 2.4Ghz Intel Core 2 Duo
How long have you left it? The vacuum cleaner cooldown phase should only last for 3 or 4 minutes.
 
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where do you check the temperature???


I have 24" iMac. When I bought it (4 months ago), fan was very silent, but yesterday when I switched my iMac on, it started very loud. I downloaded istat menu utility to check fan speeds, it shows:

CPU FAN: 3295
HARD DRIVE: 5498
OPTICAL DRIVE: 4401

cpu temperature always shows 25 C

I am only running safari, how can I decrease fan speed ? please help
 

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