Boot can only be started by pressing F8, and boot can only be started by choosing to disable driver signature enforcement, which means that the driver of some hardware installed in the system is faulty and incompatible with the system.

If you can recall what hardware driver was upgraded before, you can uninstall the driver after startup, and it will generally return to normal after restart.

If you can't remember the specific driver, it is generally a graphics card driver problem. It is suggested to try to uninstall the graphics card driver, which may solve the problem.