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GPU needs to be re-balled. It is because cooling pad on GPU is not efficient and GPU overheats, melting ball contacts. There are some re-balling services on ebay that will reball GPU and install a more efficient cooling contact on the GPU.
A laptop locks up or shuts down when it get very hot. The CPU shuts down (thermal overload) when it overheats and will not boot up until it has cooled down. If this problem is not fixed, eventually the CPU will fail.
This problem could be caused be a faulty CPU fan and/or the CPU and heat sink assemble is clogged with dust.
Check the CPU fan to see if the fan blade spins freely (it may have a seized bearing), if not replace the fan. If the fan and heatsink is clogged with dust, clean and remove the dust.
If additional cooling is required and there are ventilation grills on the bottom of the laptop, then purchase a laptop cooling pad. Place the laptop on the cooling pad, these pads have fans that direct air into the grills at the bottom of the laptop.
You are running into a CPU overheat issue.
1. can you feel or hear the cooling fan come on at all? If so try and use compressed air can to clean it out.. they get tremendously dirty. You can also try a vacuum hose, but cover nozzle with hand and only hold next to cooling fan outlet and nowehre else with laptop off and unplugged. Dont get near keys or other parts as will damage. Dont use SHOP VAC either.
2. If Cooling fan is NOT Coming on you can try a laptop cooling pad. these are external units by Targus and other companies that have cooling fans to supplement a laptop units cooling fan. You can try this to see if airflow is your problem.
3. If you recently ran encryption software, a new antivirus program, or upgraded to Windows 7 it is possible that your culprit is the unit is not cycling. Meaning the hard drive is continuously being accessed and the CPU is in constant service... this can cause overheating as well.
You could have a faulty fan and/or dust clogging the fan and heat-sink assemble. This is the most likely cause of the laptop shutting down. When the CPU overheats it goes into thermal shutdown and if this problem is not fixed, eventually the CPU will fail.
Check the fan to see it it spins freely and check if the fan works when the laptop is powered up.
If the fan and heat-sink is ok, then to give the laptop addition cooling then purchase a laptop cooling pad and place the laptop in this pad (These pads have cooling fans and helps cool the laptop).
There are devices you can purchase which aids in pulling more air through the system and keeping it cooler. One which I purchased and am quite pleased with is by Antec. It is a dual fan unit that is powered by one of your USB ports. You place your laptop on top of the unit, power it on, and it works wonders at keeping your system free from damaging heat buildup and those annoying shutdowns!
There are other units made by other manufacturers available as well. Some more expensive, some less. I have always had good luck with products from Antec and their price was reasonable as well.
When the CPU overheats it shuts down (ie thermal overload) and won't startup until it has cooled down. This problem is caused by faulty fans (with bearing problems and may not spinning at normal speed) or the fan and heatsink assembly is clogged with dust.
Check the vents and fan and vacuum and remove the dust.
If the laptop is not placed on a flat surface there may not be enought air entering the vent on the bottom of the laptop.
To improve ventillation, you can stick rubber pads on the bottom of the laptop to increase the height of the laptop off the table. Better still purchase a laptop fan assisted base and place the laptop on this base, this provides further fan assisted ventillation.
Have you cleaned it lately? If not that's what they sell those cans of compressed air for. With your computer off bloe the air through all of the vents you can locate to get all of tha accumulated dust that is blocking the airflow out of there!
Usually when the laptop overheats the CPU shuts down, and after it cools down you may be able to power it up again, unless the CPU has failed.
If you are able to get the laptop working, get the fan replaced, if it laptop doesn't boot up then there is a serious problem (most likely a costly one).