There may be several reasons why the computer boots into the BIOS:1Hardware failure: The computer automatically enters the BIOS when it boots, which can be due to a hardware failure. For example, there may be a problem with the computer's hard drive, memory, BIOS battery, and other components, causing the computer to fail to boot and automatically enter the BIOS. At this point, you need to check that the hardware of your computer is working properly and try to repair it or replace the faulty part.
2.Boot Order Error: The computer automatically enters the BIOS when it boots up, or it can be caused by the wrong boot order. When the computer's boot order is incorrect, the BIOS will not be able to find the correct boot device and will automatically enter the BIOS. At this point, you can check if the computer is booted in the correct order and change it to the correct order.
3.Virus attack: The computer automatically enters the BIOS when it boots up, which can be due to a virus attack. If the computer is infected with viruses, these viruses may modify the computer's BIOS settings, causing the computer to fail to boot properly and automatically enter the BIOS. At this point, you need to perform an antivirus treatment and try to repair or restore the BIOS settings.
4.BIOS Setup Error: The computer automatically enters the BIOS when it boots up, or it can also be due to the BIOS setup error. If the BIOS is not set correctly, the computer will not boot properly and enter the BIOS automatically. At this point, you need to check if the BIOS settings are correct and try to modify or restore. 
In short, when the computer is turned on and enters the BIOS, it needs to be analyzed and processed according to the specific situation. If you are unable to solve the problem on your own, it is advisable to seek professional help. At the same time, in order to prevent the computer from booting into the BIOS, it is recommended to regularly back up important data, maintain hardware and software, and update the operating system and drivers. 
I hope it can help you, and I look forward to your consultation and attention, thank you, thank you, thank you.