Dell 840 Turned off immediately after the power button is pressed, Connected to the power source

Table 1-2. Front-Panel Components

Item	Component	Icon	Description
1	Power button		The power button turns system power off and on.
			NOTICE: If you turn off the system using the power button and the
			system is running an ACPI-compliant operating system, the system
			can perform an orderly shutdown before power is turned off. If the
			power button is pressed for more than 4 seconds, the system power
			will turn off regardless of the current operating system state. If the
			system is not running an ACPI-compliant operating system, power is
			turned off immediately after the power button is pressed.
			The power button is enabled in the System Setup program. When
			disabled, the button can only turn the system power on. For more
			information, see "Using the System Setup Program" on page 29 and the
			operating system's documentation.
2	Power-on indicator		On: System power is on.
			Blinking: System is on but in standby state, or system is off but still
			connected to the power source.
3	Hard-drive activity		Flashes when data is being read from or written to the internal SATA
	indicator		hard drives that are connected to the integrated controller.
4	System status		Blue: Normal system operation.
	indicator		Amber: Flashes when the system needs attention due to a problem with
			power supplies, fans, system temperature, or hot-plug hard drives.
			NOTE: If the system is connected to AC power and an error has been
			detected, the amber system status indicator flashes regardless of whether
			the system has been powered on.
5	Security lock		Controls access to the system’s internal components.
6	USB connectors		Connects USB 2.0-compliant devices to the system.

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