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The fans change speed depending on the temperature the sensors detect.
Give your machine a thourough cleaning.
The CPU sensor is usually located under the CPU if it's loaded with dust it may think it's hotter then need be and kicks the fan up.
More likely is that the computer cpu is overheating and the motherboard is ramping up the cpu fan speed to try to cool it, hence the high fan speed and consequent noise. This usually happens when the heat sink is clogged with a lot of dust. It could just be that the fan heat sink came loose.
It may be that it's just a noisy fan, in which case replace it with one that doesn't make as much noise.
It sounds more like the hard drive, the fan has nothing to do with your computer booting up. If the hard drive is starting to go bad it will not boot up, that's what it sounds like your computer is doing. I recommend checking out the hard drive and replacing it.
Your cpu might be getting too hot...
If you have not done so, it would be a good idea to get some quality thermal compound,such as Arctic Silver, and carefully remove your heatsink/fan, clean the surface of your cpu, and the bottom of the heat sink, and re apply an even, thin coat of thermal paste. Reattach the heatsink/fan assembly, and reboot the computer. On start up, enter the BIOS and check the hardware monitor to see what the cpu temp is..Hopefully you will have it running cooler than it was.
depends on the noise. Rattling: Ensure that all cables are out of the way and not touching the blades. Loud screaching noise: replace the fan immediately. now when you say mother board fan is it inbuilt?
All computer fans have a general design. The name in front of "fan" really refers to the designation. You'll see case fan, processor fan, CPU fan, cooling fan, etc. In the case of CPU/Processor fan, some are sold with heatsinks (the metal block sitting on top of your CPU).
The first thing you want to do is make sure the fan is clean. Chances are dust buildup is causing the excess noise.
If that's not the case and you're looking to replace the fan, then you first need to find out the size of the fan. General sizes(diameter X width in mm) are listed on this page:
Generally, you're looking for something that will match the size of what you're replacing & push enough air at a reasonable noise level to cool the heatsink/CPU. You want to stay in the area of 30dBA max for noise. You also want to see if it has a 3-pin or 4-pin connection.
For example, if you have an 80mm fan, I would suggest something like this:
It's pretty quiet with good airflow. Also, it has a 3-pin connection, but includes an adapter for a 4-pin connection.