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Sounds like the laptop just needs a right good clean out of dust. Get a can of compressed air and clean the air vents and the fan grill if you have access to it, that should quieten the laptop down. Dust is a common cause of noisy fans.
You didn't mention what make and model laptop you have but here is a general solution. Laptop overheating issues almost always involve fan blockage, or a bad (non-functional) fan. Some are easier to access than others. Look at your laptop and see if you have access from the bottom. You could possibly even access by removing the keyboard. IF you can access the fan you should clean out any lint or dust that is causing blockage of airflow (some dis-assembly may be required). KEEP IN MIND that if you remove the fan heatsink assembly you will need to re-apply thermal paste or compound to the area between the CPU and heatsink.
My guess is you will find that you have a strip of lint blocking the airflow between the exhaust of the fan and the heatsink fins.
Almost certainly a clogged cooling fan , vents or build up of dust on the cooling fins. You will need to gain access to the CPU fan and remove the heatsink assembly, blow all dust out of the cooler matrix, clean the fan blades and the cooling vents. Clean off any thermal paste on the cpu and regrease with new paste, refit and reasemble.
You CAN cut corners by cleaning it "in situ" but a thorough cleaning is advised.
Eventually if not cleaned, teh graphics chip will fail with overheating
It sounds like you do have an overheating problem. When the laptop is running, peek inside the vent on the side or bottom of the laptop and determine if the fan is running. If it is running slow or completely stoped, that is your issue and it should be replaced by a local repair shop.
If the fan seems to be running fine, you may be able to deal with the problem and extend the life of the laptop a little by buying a laptop "cooling pad" which will have cooling fans of its own.
It is because of the laptop overheating problem. This is a very common problem with and could be easily fixed if you clean the heat sink.
If the CPU heatsink is not clogged with dust and lint completely, you can use canned air and just blow it inside the laptop through the openings on the bottom and on the sides. It’s nice as a precaution measure, but it might not work if your laptop already has a problem and the heatsink is completely clogged.
Open the laptop case, so you can access the CPU fan and the heatsink. In some cases you can access the heatsink through the latch on the bottom of the laptop. Sometimes (for example Toshiba Satellite A70/A75) you have to open the laptop case all the way down.
Carefully disconnect the fan cables on the system board and remove the fan. If the fan makes unusual sound when it spins (grinding sound), I would recommend to replace the fan.
Clean the fan and the heatsink with compressed air.
I would also recommend removing old thermal grease from the CPU and applying new grease for better heat conductivity.
Try vacuuming the airvents and see what happens. Also make sure you are not blobking the airvents in anyway. Another way would be to open the laptop and reseat the CPU heatsink but this is only for advanced users.
If it's overheating it's possible that either there's a problem with the fan, or the fan/heatsink is clogged with dust. If you know how to open up the laptop you can do that and use a can of compressed air to clean it out which may solve the problem. If not you'll have to replace the fan.
There is usually a screw or two inside the memory access panel, hard drive access panel and/or under the battery. Make sure you have checked/removed all of these.
Does it appear to be loose for the most part? Even once the screws are removed there may be interlocking clips along the edges the hold the housing together. you can test one spot with a small flat screwdriver to see if it "pops" apart.
Here is a website to find service manuals/info as well: http://www.eserviceinfo.com