Dell DCDO, 710 H2C service manual LEDs see About Your XPS Computer, Performance

USB Controller	Enables or disables the internal USB
(On default)	controller.
	Off — The USB controller is
	disabled.
	On — The USB controller is
	enabled.
	No Boot — The USB controller is
	enabled; however, the BIOS will
	not recognize USB storage devices.
	NOTE: Operating systems with USB
	support will recognize USB storage
	devices regardless of the No Boot
	setting.
1394 Controller	Enables or disables the integrated IEEE
(On default)	1394 controller.
	Off — The 1394 controller is
	disabled.
	On — The 1394 controller is
	enabled.
Serial Port #1	Disables or selects the address for the
(Auto default)	integrated serial port and determines how
	the serial port operates.
	Off — The serial port is disabled.
	Auto — The BIOS selects between
	COM1 and COM3; if both resources
	are in use the port is disabled.
	COM1 — The port is configured at
	3F8h with IRQ 4.
	COM3 — The port is configured at
	3E8h with IRQ 4.
PS/2 Mouse Port	Enables or disables the onboard PS/2-
(On default)	compatible mouse controller.
	Off — The PS/2 legacy mouse port
	is disabled.
	On — The PS/2 legacy mouse port
	is enabled.
LED color	Adjusts the color of the front and back
	LEDs (see About Your XPS Computer).
Performance
Hyper-Threading	Specifies whether each physical processor
(On default)	appears as one or two logical processors.
	Off — Hyper-Threading technology
	is disabled.
	On — Hyper-Threading technology
	is enabled.
	NOTE: If your processor does not
	supports Hyper-Threading, this option
	does not appear in the Options List.
Multiple CPU Core	Specifies whether the processor has more
(On default)	than one core enabled.