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Sounds like a bad hard drive or a bad CPU Fan. Try a different hard drive in the machine, and see if the machine boots up without making that sound and locking up. If it does then that means the original hard drive is bad.
If its not the hard drive then, replace the CPU fan and see if the sound goes away, if it does then you know the CPU Fan is bad.
depending on the kind of sound from the fan, you need to make sure nothing is in the fan path, and dust free, if not replace fan., about your drive to spin up, assuming you are refering to the Hard drive, replace the drive, seem to me the noise is coming from the hard drive, which indicate that your drive is about to go bad, time to back up your datas
"Loud noise" implies either the fans, the hard drive, or the optical drive, as those are all the moving parts in an iBook. If it won't start up, I'm guessing you have a bad hard drive. If so, you can revive your machine with a new hard drive, but your old files are probably toast unless you have backups.
Well there is no fan on the actual Harddive Fans, Unless you mean the PC Case fans, in which dust built up on it wouldn't make a loud whirring noise. If it is, it's because the fan's ballbearings are bad and you need to replace it. The harddrive is a Small rectangular silver or black box on the inside of the case towards the front. If the loud noises have started coming from there then the Harddrive is going bad, and you might want to back up your data immediatly.
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If it says that the hard drive is not detected, then most probably its a busted hard drive. I doubt it's a motherboard issue since it was able to tell you that it can't find a hard drive. Plus the fact that there are spinning noises which can only come from either the hard drive or the fans.
Yes. It can be replaced. Try to check which fan is making that sound. Do you have a laptop or a PC? On a PC, there are 3 standard fans inside it. one for the CPU, one for the power supply and one for the computer casing fan as well. It depends on which of those fans it's coming from. On a laptop, some laptops' fans actually makes a loud noise which is common but there is a way that it could be lessened but it might slow down your pc and it might overheat it as well. The loud noise on the fans of a laptop actually indicates that it's trying to cool down the system. If it doesn't stop the loud noise, it could indicate a problem switching the fans back to normal and would just continue to spin fast. Try to contact your PC tech for further diagnostics on the laptops fan to indicate if the problem is with the fan or the mainboard as well.
The only sure way to quiet it down is to replace the hard drives with newer ones, that you have selected based on their noise rating, AND to replace all the fans in the machine with fans that you have selected based on their noise rating.
I did this for my self-built machine last year and never regretted spending the money on new drives and new fans. It's SO much quieter! ;)