Hi Volgin212,
We would like to know more about this PC.
>The Windows operating system installed.
>Since when are you facing this issue.
>Any recent software or hardware changes done on this PC
If the PC is shutting down before login into Windows, we might be suspecting the issue to be with the power module or the faulty boot sector on hard drive.
>Check with different AC adapter and battery to see if the issue happens.
>Perform hard drive test in the start-up menu,
Power on the PC and tap on F2 key >> Look for component test >> Select Hard Disk >> Perform both Quick test and Extensive test.
Let us know your observation. We are here to help you out in isolating this issue. 🙂