I have the exact same problem, I dont think it has anything to do with the battery, as I have taken out the battery and run my laptop on power supply only, I thought it was my battery too but while using my laptop the screen will just go black and then shut down with no form or warning or anything.
I have removed programs and software that I do not use, cleaned my desktop, run BIOS tests, and still the same problem???
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Re: Laptop shuts down abruptly
Another venue yopu might consider is removing the hatch cover for the processor and remove the heat sink retaing screws. Lift off the heat sink and wipe the center contact area with a clean dry cloth, you should see a pencil collored mark on the cloth. then do the same to the processor in the center where it contacts the sink only.
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Abrupt shutdown commonly is caused by overheating. This is mostly caused by a faulty CPU fan. Check if the surface of your laptop gets warmer than usual. If so and if you are accustomed to disassembling electronic devices disassemble the laptop and clean the fan and heat sink. Otherwise visit a technician.
Does this occur when you open a specific program for eg. windows media player etc. Note that the application may open and run for a while or even run perfectly sometimes, but observe if the abrupt shut down has any relation to a specific program. If so checking you Ram or using an alternative software will resolve your issue.
NOTE: Some viruses may cause such actions. Scanning your computer with the latest virus definition updated anti virus may solve your problem.
Well some times if your processor gets on heat, it might turn off,s o i will suggest you to keep you laptop on a glass table and than use it, and you an try in safe mode as well and check if it works fine there ot not, if it wrks fine there than that means there might be some virsues or something or some thrid oarty software conflict.
Yu can check event viewer there you can find the exact cause for your shut down.
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.
try disabling ACPI (Advanced Configuration Power Interface) in BIOS screen, if you have that option. Something does not agree with Windows control of all ACPI devices...could be the modem or ethernet network. Also, if no success, try disabling "allow this device to wake computer" for either (or both) the modem or ethernet network devices in control panel-system devices option screen.
It sounds like something is overheating to me. Also, it could be a bad motherboard. Try putting your laptop on a hard surface. I carnt stress this enough. Also, you can try cleaning out the laptops cooling vents with some compressed air (you can get it at pcworld). At the end of the day and it still wont work, send it in for repair. Good luck