Change the settings in BIOS, while the computer restarts, quickly press F2 or the DEL key on your keyborad (it depends on the computer which button is to enter BIOS), there you can change the fan speed to work at which speed, but beware with the settings, you might spoil things up, find for Advanced settings tab and you may find it there..
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Possibly it is overheating, which would depend on how often it runs, and how fast. During startup, it is normal for a fan to run at high speed, but if it's on constantly in sleep mode, I would look towards an overheating problem. Open it up, check for, and clean any dust around the heatsink / fan, and power supply fan. Also make sure that outside the PC there is plenty of space to allow airflow.
Clean the internals with a soft brush. Make sure the power is unplugged first and only use the brush to loosen the dust build up in the case. You can remove the fan and clean it properly out of the case, this will give the fan better efficiency, so it won't have to spin so hard to give the same cooling.
Open up the computer and clean the dust out of the fan and processor heat sink. If it is a temperature-controlled variable speed fan, it will probably not have to work so hard to keep the processor cool.
If it is a fixed-speed fan, it may be getting loud because the bearings are wearing out. Gently try to rock the fan blade unit - it should not have any wobble or slop in the bearings, and it should rotate easily.
If necessary, clean as much dust as you can out of the power supply without taking it apart.
Do not use a regular vacuum cleaner to **** dust off the motherboard. The high-velocity airflow may generate electrostatic charges that can damage the board. It's probably OK to vacuum out the heat sink if you hold the fan still to keep the vacuum cleaner from over-speeding it.
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.
This indicates that the Processor is getting too hot. When the Processor gets hot the computer is programed to increase fan speed to cool itself down. To solve this problem you will want to install a chassis fan in your computer's chassis, either bringing freash air into system (intake) or as an exhaust blowing air out of your computer system. Purchase them at your local computer store they are inexpensive and are a great asset to your computer system.
Another option that will help the most is to clean the processor fan of dust. Dust accumulates over the heatsink and prevents the cool air from cooling your processor. Remove the dust with a vaccum cleaner and a paint brush. Do it in a very gental manner as you don't want to damage the fan blades. In some cases it is possible to remove the fan and get at the dust that way.
You said that you got some canned air to blew it out... what I normally like to do is simply use a vacuum and **** up as much dust as possible (besides who wants dust in your face?). Once that is done, I would advise that you take off the fan from the CPU cooler itself and get in there with either the canned air or vacuum... simply because with the fan still attached, there is possibly still a layer to caked dust under the fan and on top of the heat sink.
If it is any of the other case fans, I would either get in there and vacuum them out really good or simply replace them. My computer use to sound like a jet engine after 2 years but when I replaced my fans (with cool blue LED ones) it was significantly (can't stress enough) quieter. Most fans are of course using ball bearings, so if you can imagine the bearings getting a good layer of dust in them as well...
Yeah the slowdown is the laptop throttling back due to overheating.
When you do processor-intensive work like - streaming videos - the laptop overheats. The fans come on loudly.
When the computer heats up despite the fans, the processor throttles back to relieve the heat.
When you reboot your machine, it stops performing intensive work, giving it a chance to cool down. It's not restarting that fixed the problem it's the fact that the laptop cooled down.
So here's what you do. Get an air duster and blow all the dust and gunk out from your fans. They are most likely clogged with dust and that's what's causing your cooling problems. If there are large dustballs in there, use a tweezers and pull them out. Get as much out as possible.