IBM T21, T22 manual Indicator Meaning

		Product overview
Indicator	Meaning
Scroll lock	Green:	Scroll Lock mode is enabled. Arrow
		keys can be used as screen-scroll
		function keys, but not to move the
		cursor. To enable or disable Scroll
		Lock mode, press Fn + ScrLk key.
		Not all application programs
		support this function.
Power on	Green:	This indicator stays lighted
		whenever the computer is on. If
		the power-on indicator is on and
		the standby indicator is off, the
		system is ready to use. If both the
		power-on indicator and the standby
		indicator are on, you can use the
		computer after it returns from the
		standby mode and the standby
		indicator goes off.
Battery	Green:	The battery is fully charged.
	Blinking green:
		The battery has enough power to
		operate, but is being charged.
	Orange:	The battery power is low. The
		battery needs to be charged.
	Blinking orange:
		The battery needs to be charged
		when the indicator starts blinking
		orange, the computer beeps three
		times.
Standby	Green:	The computer is in standby mode.
status	Blinking green:
		The computer is entering standby
		mode or hibernation mode, or is
		resuming normal operation. This
		indicator does not blink in Windows
		2000, Windows Me, and Windows
		XP.
Ultrabay	Green:	An Ultrabay 2000 device is
status		installed and in use.
	Blinking green:
		An Ultrabay 2000 device is in the
		process of being detached.
	Turn off:	An Ultrabay 2000 device is ready
		to be attached or detached.
	Note: If you are using Windows 2000 or
	Windows XP, the Ultrabay status indicator
	does not blink while an Ultrabay 2000 device
	is being detached. Instead, a message box
	pops up when the process is completed; then
	the indicator turns off.

ThinkPad T20, T21, T22 and T23 series 45