This could be a variety of different problems. Could be your battery failing or even something overheating in your computer. Have you ever had someone open and clean out your laptop?
SOURCE: Battery shows 50% charge, but Laptop powers off
The battery is most likely bad. have you tryed another one?
SOURCE: hp laptop shuts itself down
Get a can of air and really blow the intake & exaust ports and ALL fins. A laptop cooler really helps with this problem but, you have to blow them out too.
Google HDD thermometer and download a temperature indicator. It will show you when things are starting to heat up. Mine runs between 25-33 degrees celcius and will shut down randomly around 34 or above.
SOURCE: Monitor shutting off but computer not losing power
There are two ways to discover the problem. The problem is either a software problem or a hardware problem. Since it's easier to discover a hardware problem, start there.
Did your laptop come with any kind of diagnostic software? I would run that first. The other thing you can do is to boot the system up and enter the system BIOS. Set the defaults, reboot the computer and see if the problem persists. If it does, you can reboot the system, press F8 several times, which will prevent Windows from starting and will give you a Start Up Menu. Press the down arrow key and choose Command Prompt. Leave the system running in this state and see if the problem occurs. If it does, it proves the problem is a hardware problem.
Running Diagnostics is the easiest and quickest route for discovering hardware issues.
SOURCE: download shuts down laptop
Please run system restore to factory setting but be sure you backup your documents
SOURCE: HP Pavilion dv6449us laptop noisy fan
you may find replacemente in some electronics shops dedicated to laptops spares.
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