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You did not post anything about make and model. This is kind of a guess.
My laptop has "battery saving" setting that operate the fan based on temperature. When I start up, the fan comes on and the computer checks itself, Then the fan slows down. Later when the laptop warms up, the fan speeds up. See if you have some power management scheme set that makes the fan run like this before you take it to the shop.
If the games that cause your computer to shut down feature high resolution graphics or fast 3D rendering, then the problem could be insufficient processor cooling. Once the processor gets overheated, it goes into thermal shut down.
If, while you play, the computer runs hot before it shuts down (check the cooling fan outlet), then these are some of the possible reasons:
-cooling fan blades could be obstructed by dust - cooling fan needs to be cleaned or replaced
-heatsink radiator and / or air outlet could be obstructed by dust - also need(s) to be cleaned
-thermally conductive grease on the microprocessor heatsink could be partially or entirely dried up - old grease needs to be carefully removed and new grease applied (caution - do not use any kind of thermal grease that contains metallic particles like silver or aluminium - you might short out the processor - only use the kinds which are electrically nonconductive)
of course the problem could be elsewhere, but the above mentioned problems turn out to be a common issue with many laptop computers after a few years use, regardless of manufacturer brand and model, also it could be any of or the combination of any or all of the above problems (obstructed air outlet leads to more dust being deposited on the fan blades, more dust on the fan and outlet leads to processor overheating which leads to thermal grease drying which leads to even more overheating and so on...)
A google search with the Laptop Model and Part number from the Fan/Heatsink is always a good place to start. Also, ebay can turn up some really good deals on laptop parts. Here's a link to a Fan/Heatsink combo I found using a Google search within the shopping section.
The fan makes noise in high preformance windows like windows vista&7. So it is normal, because the windows uses motherboard,ram and graphics card with high preformance so they get hotter, so the fan get stronger to cool them or they will be damaged.
This noise also exist in windows xp, but only when opening high graphics game, or being working with the laptop for along time.
The sound is probably the fan kicking into high gear to cool the computer while you play games. If you can get past the juet engine, the games worth it. Try spraying compressed air into the heat vents to clear up the dust on the inside, then the fan doesnt have to work as hard to keep the laptop cool.
Or if you have good lungs you can try blowing in the vent...
It is obvious that your computer shutdown because it is overheating. try to get a chill mat to place it under computer. you said that it does not shut down when is on battery??? do you play games when is on battery?....computers normally overheat during large processing tasks such us playing video games. Try to fans clear do not place your laptop ontop of your bed or anything that will obstruct the fan under computer.
First Charge up you battery while the computer is off. Once fully charged unplug the adapter and play the game...see if it shuts down. If not replace that ac adapter.
If it still shuts down...
Your unit is overheating most likely. When you play high tech games which cause the processor and fans to run harder once it gets to hot. And most times you can hear the fan running loud on your laptop.
1. check the system requirements on the game
2. Are you overclocking your processor, check your bios
3. Lower the graphics settings and features in your game.. see if it shuts down
3.Or while you are running the game do the follow
hit ctrl, alt, del buttons at the same time. A task manager box will pop up.
Click on the tab Performance.....what is your cpu usage? 100% if so it's running the proccessor hard. Now in the same box click on Processes, then user name, you will then see all processes that are running at that time.
If you want to play the game off line...only!!!
you can stop some processes from running.
On the bottom right hand corner of your screen by the clock you will see icons that load up at startup. Right click the ones not in use, like virus scan, firewall, other background applications that are running by right clicking over the icon and exiting or closing the application. Now keep in mind before you go back on line you should restart your computer so your security software will reload.
Other reasons would be internal cleaning, fan, heatsink replacements and so forth. Which may need to be performed by a professional repair shop. Now they do have a laptop colling pad which have worked for some people. Also these laptops can overheat quickly, do not sit them on beds, and your lap when using ventilation is important. And also you might still want to have that ac adapter checked out.
If all else fail... restart you computer in safe mode...try running the game..see if it shuts down.
Good luck with your games