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Try removing the battery completely and running it with the power supply connected. If that doesn't work, try borrowing a compatible power supply, or buy a universal one, and try with and without the battery connected. The problem may be the power supply, in which case the battery won't charge and the laptop won't get any power.
Few reason for the shut down
Could be heat, electrical,
1. try cleaning all vents with compress air in order to remore dust and fuzz that can be cloging the vents.
Once this done, verify that fans works proprelly,(check air flow coming out of vents) if they dont they will need to be replace or cleaned out.
2. Check power supply unit, and battery.
Sometime power supply unit is defective, getting too hot and power output is not stable and shuts down the laptop. ( change power supply unit) check if battery hold charge. if not change battery
3. Check connections for looseness and contact
If all seems normal,and none of the mentionned point seem to be defective, the cause is deeper and would need to be looked at by a technician.
My first guess is that your laptop is over heating. Even with a fan underneath, if the bottom vent is clogged with dust, the CPU will still get too hot. Does your computer last longer when you run less programs? I would check for dust around the fan inside your laptop. There's a video on youtube showing an acer being disassembled:
Although it may not be your laptop specifically, hopefully it will head you in right direction. It would be a bad idea to blow the dust further back into your computer, so you may have to loosen some screws and buy a electronics duster from an office supply store, but it should solve the problem. I've ran into this a lot over the years, specifically with Acer and Dell computers. Hope this helps!
There is a class action lawsuit currently being initiated against HP for this issue. The Complaint alleges that HP misrepresented and concealed material facts regarding certain laptops including a design defect, which causes the power jacks of the laptops to fail.
Try running it without the battery and see if it does the same. Sometimes a bad power supply will cause a short to develop in the battery. If it stops shutting down without the battery the you'll need a new battery.