Sooner or later, every user is faced with a problem when the computer does not boot. There can be many reasons for this. It is necessary to pay close attention to all the symptoms of this common "disease" in order to make a correct diagnosis. But first things first.

If your device started up immediately, the symbols of the usual inscriptions appeared on a black background, but the operating system did not fully load, then you should determine one of the following problems using the elimination method.
The simplest situation, which occurs very often and is the reason why the computer does not boot up - the keyboard cord has moved away from the system unit socket. To eliminate this trouble, you must turn off the power of your computer, check and properly connect the keyboard cord to the system unit, and then restart the device. If this was the reason, then Windows will boot successfully. If not, go to the next paragraph.

The computer does not boot up because there is a possibility of various hardware problems with the hard drive, as well as the solid state drive in laptops. A distinctive feature of this malfunction will be the inscription in English that appears on the display. Here it is unlikely that it will be possible to do without repairing the corresponding element, and in the worst case, you may need to restore personal data.
The next reason why the computer often does not boot up is the activity of various viruses or some system failures of the operating system. In those and other cases, it is damaged at the program level of Windows. You will have to be treated by demolishing the old and installing a new operating system.
Quite often, the computer does not boot up also because a virus application blocks this process. In this case, you must also reinstall the system.

If you set the boot options to boot from flash drives or CDs, remove all flash drives with disks and restart your computer. If this was the reason, the download will proceed properly.
There is also, albeit a low, chance that your hard drive is starting to break down. This can occur after mechanical damage to the system unit or due to its fall. If this is the case, then you urgently need to seek qualified help from specialized specialists. Otherwise, you risk losing all your information.
Finally, consider one moreproblem. It happens that recently connected devices for some reason do not allow the computer to boot. Therefore, disconnect everything except the manipulator and keyboard. then restart. If the device boots up, look for the reason in the additional equipment.
There are other symptoms when the computer won't boot. A black screen is an indicator that there is no power. In this case, check the integrity of the power cord and the operation of the unit. If this is not the reason, contact the workshop.