First of all, we need to check if the power cord is plugged in tightly and make sure that the outlet is powered properly.
Sometimes, computer startup problems can be caused by a system failure. At this time, we can try to press and hold the power button for more than 5 seconds until the computer shuts down completely, and then restart the computer.
If your computer can't get into the normal system interface, you can try to enter safe mode. After starting the computer, press the F8 key (different brands of computers may vary, please refer to the computer manual for details), and then select "Safe Mode" to boot up. Once you are in safe mode, you can try to repair your system or uninstall some software that may be causing problems.
Desktop computers may get error messages such as blue screens during the startup process, and you can try to use the System Recovery feature. Once you have started your computer, press the F8 key to enter the boot options menu, select "Repair Your Computer", and follow the prompts. The System Recovery feature can help you revert to a previous point in time to resolve some boot issues caused by system file corruption or errors.
First, back up your important files and data, and have your operating system's installation disc or USB flash drive ready. Then, follow the prompts for the steps to reinstall the operating system.