According to my research, 90% of the time; this is caused by overheating issues. If it happens too quickly after reboot, use safe mode (F8)
Here are 12 most common reasons why a computer turns off without warning:
Source (with even more solutions): https://www.auslogics.com/en/articles/pc-turns-off-without-warning-fixed/
1. Overheating, 2. Hardware Problems, 3. Driver Issues, 4. Malware Infection, 5. Battery Problems, 6. UPS / Surge Protector Failure, 7. Insufficient Charger Voltage, 8. Dodgy Sleep Mode, 9. Fast Startup Disadvantages, 10. Out-of-date BIOS, 11. Software Failures, 12. Problematic OS
Possible causes and solutions
0. Something could be loose
Check power cables, power strips, internal and external pc components…check the DUH things first. Is your computer connected to faulty UPS?
1. The computer could be too hot!
Temp utility HWMonitor > https://www.cpuid.com/softwares/hwmonitor.html
Solutions (take them one step at a time to narrow down the root cause)
Take apart the computer and physically clean it out. Vacuum, compressed air.
In the software, change the power settings:
https://www.youtube.com/watch?v=xJKrydbwtWc
Win+r (run)
Control (to open control panel) hit enter
Hardware and sound
Power Options
Balanced > Change plan settings
Change advanced power settings
Processor power management
Add fans
2. There are issues with the hard drive or other components
Run a check disk function (cmd prompt – run as administrator)
https://www.youtube.com/watch?v=VGBtmk-EmhE
Chkdsk C: /f (you will need to wait and then restart)
Replace components if you suspect they are going bad. This one can be a slippery slope. Start with CPU, then ram, power supply, graphics card…it could also be the motherboard.
This guy has some crazy ideas about RAM:
https://www.youtube.com/watch?v=42OT7JBae0E
One guy in a thread found out it was his PS2 keyboard…when he replaced it, it fixed the problem.
3. Software issues
Turn off FAST START, Update component drivers, or update BIOS
https://www.drivereasy.com/knowledge/computer-shuts-down-randomly-solved/
4. You have a virus or malware
Virus scan > Download Malwarebytes
5. More solutions from computer hope
https://www.computerhope.com/issues/ch000689.htm
