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Usually there is a fan on the CPU heatsink and a fan in the power supply. Open the case and turn on the computer and use a small timber stick and poke it into the CPU fan to stop it spinning and if the noise stops then this fan needs replacing. If it is OK the the fan in the power supply is faulty. I recommend you replace the power supply because there are dangerous voltages inside this power supply.
If it is the power supply fan, typically at the top of the unit making the noise, it is not replaceable by most folks. You'll need a new power supply which are in the $40-75 range. Some private shops will replace the power supply if you buy it from them at no charge, but most big box stores will not. Depending on the brand they are easily replaced. Dell makes theirs unique and tough to replace without modifying the case. Don't know about Sony.
The other fans can be replaced and are fairly cheap. Open the case and determine which one is making the noise. Carefully remove it, take it to your computer repair shop, get a replacement and reinstall. Shouldn't take more than an hour total.
Hope this information will help.
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Can you tell whether the buzzing sound is coming from the power supply fan, the disk drive, or maybe an internal fan? I can't imagin it's the power supply fan, as the whole system would likely just cut out.
If it's an internal fan (CPU fan of graphics card), the system will come up to some random point before a component overheats, and usually the device will cut out in order to protect itself. You may be lucky and simply be able to replace the errant fan, or you may have to replace the component itself. Only if you feel confident enough, you may try to open the case and see if you can tell better which component is failing; take all precautions when operating a system with the case opened, and ensure that you do not touch any internal parts even while the power is switched off, as power supplies can retain a charge even when switched off and unplugged from the power supply.
If the buzzing sounds a bit "clunky", it may be your hard drive that's failing, in which case, the prospects for recovery are limited - you will probably have to replace it and reinstall the operating system and any software you have.
Grrrrrrr - Could be CD running, Could be Fan on the CPU, which if not fixed will kill you main chip, could be power supply fan, check in the back and see if fan is turning consistanly ( I think that is how you spell that) If you know how to remove covers, take side off and look at fan on the CPU or other fans and when you hear the Grrrrrrr se if you can tell where it is comong fro, also some hard drives will make a sound as they get older.. Good luck....
Are there other fans (other than the one you replaced) in the system? Many times, even with systems that use one main fan to cool the CPU and case, there can still be a fan within the power supply. There's a good chance that the power supply fan is the noisemaker. Also check for a fan on the video card.
Check to make sure there are no wires or debris that could be lying against the fan blades.
Usually the fan on graphic card dies first. It can be replaced with another one but I'd suggest you to build in 80 or 100 mm fan to blow directly on your graphic card cooler. Remove the lid and check if perhaps some cable has fallen close/into fan blade. It must be one of those two. I'm 90% certain.