This is the self-test function of the motherboard, not a problem. Now some new motherboards will have this function. When the power is turned on, the computer will check itself, but it will not start. The CPU fan of the motherboard will rotate during the test, but it will stop after the test, and the display will not appear any phenomenon. The motherboard fan stops, and it will automatically enter your system at this time. This phenomenon belongs to the normal computer motherboard self-checking function, and there is no problem. If you are still not sure, call Lenovo customer service.