My Acer Aspire Notebook turns off all by itself just after turning on, or after Windows shows up. I can hear a click from inside, than it’s off.
First of all, turn on the notebook and listen for the cooling fan. Does it spin at all? Usually you can see the cooling fan though the air intake grill on the bottom of the notebook. If the fan doesn’t spin, it’s possible you have a failed fan and the notebook turns off because of overheating. If that’s the case, the cooling fan has to be replaced.
If the cooling fan works properly,listen for the hard drive sounds. It’s possible you have a failing hard drive. If the hard drive makes clicking noise, it’s bad and has to be replaced.
If the hard drive is failing, you still can try recovering data using an external USB enclosure.