A method of powering on a server is provided, wherein the server includes power consumption modules with the same functions, connectors, and a BIOS (Basic Input/Output System). The power consumption modules are connected to the server via the connectors respectively. This method includes the steps as follows. At first, the BIOS detects a delay power-up setting. When the delay power-up setting is detected, the BIOS staggers initialization times of the connectors, so that the connectors can be initialized respectively. When one of the connectors has been initialized, the connector is electrically connected to the corresponding power consumption module, so that the power consumption module can be delayed to be powered on.