Dell PowerEdge R900 Hardware Owner's Manual (PDF) - Page 14
before the power is turned off. If the, system is not running an ACPI-compliant - drivers
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1 Power button/indicator. 2 NMI button. 3 System identification button. The power-on indicator lights when the system power is on. The power button controls the DC power supply output to the system. NOTE: If you turn off the system using the power button and the system is running an ACPI-compliant operating system, the system performs a graceful shutdown before the power is turned off. If the system is not running an ACPI-compliant operating system, the power is turned off immediately after the power button is pressed. Used to troubleshoot software and device driver errors when using certain operating systems. This button can be pressed using the end of a paper clip. Use this button only if directed to do so by qualified support personnel or by the operating system's documentation. The identification buttons on the front and back panels can be used to locate a particular system within a rack. When one of these buttons is pushed, the LCD panel on the front and the blue system status indicator on the back blink until one of the buttons is pushed again. 14 About Your System