Spins like it's going to blow up when I first boot up my machine

Stand back!
When I first turn on my iMac in the morning, it makes this terrible whirring sound that continues to get louder and louder and sounds like it's spinning faster and faster until I finally just turn it off. I then leave for 5 minutes, go grab a coffee, and when I come back, I turn it on and boots up just fine, no weird noises, nothing.
Is my hard drive about to crash?
I only bought this machine in March 2005!

Have your tried resetting the PRAM - this is frequently suggested as a cure for loud fans. See this KB article on resetting the PRAM.
Have you tried repairing your disk, either from the install disk or by running fsck? See this KB article on both these procedures.
You could also try leaving your computer on (in sleep mode) rather than shutting down - I read somewhere that the fans come on like this when starting up because something is missing from the start-up procedures, and so the fans come on by default. Unfortunately, I can't trace that information - I'm sure one of the more expert posters here will put you right on this.
Is my hard drive about to crash?
You can check your hard drive by going to your Utilities folder and opening the Disk Utility app. Then select your physical hard drive (not your start up volume) and check that the SMART status reads "verified".

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Serious problem - My MAC seems its going to blow, after booting the system.

Hello.
I own a PowerMac G5 1.8mhz, with Tiger 10.4 (up-dated to 10.4.9 i think) and,
I was passing trough crashes in FCP 5 & Compression, and decide to format the disk and re-install Tiger.
The crashes didn't stop, and now things got worst:
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thankyou. THANK you.
thankyouthankyouthankyou!
sorry about no screenie but the first option worked (at least so far!)
THANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOUTHANKYOU

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Spins like it's going to blow up when I first boot up my machine

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