Press F8 immediately after starting the machine until the advanced option appears. Select "Last Correct Configuration" and press Enter to repair. It is not yet possible to press F8 to enter the safe mode to restore or reinstall the system (if reinstallation is the same, it is recommended to overhaul it. If you can enter the safe mode, it means that you have installed inappropriate things, and all the inappropriate things downloaded before the accident will be uninstalled, or the system will be restored or reinstalled. If your computer is Win8, you can't enter the system.
hardware is the cause. Pull out the motherboard battery to discharge, plug in and out the memory, and clear the graphics card. Check whether there is something wrong with the hard disk. If it doesn't work, go ahead and repair it.
You really can't just reinstall the system. If you can't reinstall it yourself, go to the maintenance office and ask someone to help you. If the machine can't be turned on in any way, it is caused by a sudden shutdown, which has caused damage to the disk. One is to take out the battery of the motherboard and discharge it. The other is to try it on for a while, or it can't be repaired.
one is to put it away for half a day or one day, and sometimes it will recover itself, and the other is to reinstall the system.
as long as you pay attention to your computer, it won't be like this when you turn it on.