A power-on test system is used to test a number of blades of a blade server. The power-on test system supplies power to the number of blades. The power-on test system times for the blades after supplying power, and determines whether the blades are powered on after supplying power. If one of the blades is not powered on, the power-on test system determining whether an accumulated time is less than a set power-on time. If the accumulated time is equal to or greater than a power-on setting time, the power-on test system sends internet protocol address of the blade being not powered on to be displayed.