Xerox 4540 Service Manual - Page 37

5 Top (disk drive or fan fault) 6 Rear (power supply or system controller fault) 7 System over temperature 2. Use a nonconducting stylus to press and release the recessed Power button on the server front panel. See FIGURE 2-1. When main power is applied to the full server, the Power/OK LED next to the Power button lights and remains lit. 2.2 Powering Off the Server To power off the server from main power mode, use one of the following two methods: ■ Graceful shutdown: Use a nonconducting stylus to press and release the Power button on the front panel. This causes Advanced Configuration and Power Interface (ACPI) enabled operating systems to perform an orderly shutdown of the operating system. Servers not running ACPI-enabled operating systems will shut down to standby power mode immediately. ■ Emergency shutdown: Press and hold the Power button for four seconds to force main power off and enter standby power mode. When main power is off, the Power/OK LED on the front panel will begin blinking, indicating that the server is in standby power mode. Caution - To power off the server completely, you must disconnect the AC power cords from the back panel of the server. 2.3 Automatic Power-Off Events The service processor shuts down the system if it detects an overtemperature condition. The hardware shuts down the system immediately if any voltage is out of spec, or if the last working power supply fails. See Section E.2, "Power-Off Sequence" on page E-4 for a diagram of the power-off sequence and its timing parameters. Chapter 2 Powering On and Configuring BIOS Settings 2-3