The following table shows what the LED status indicators are for and what the different colors or blinking of the lights mean.

Index number	LED indicator	LED indicator color	LED indicator meaning
1	Ultrabay Slim status	Green	An Ultrabay Slim device is installed and in use.
		Blinking green	An Ultrabay Slim device is in the process of being detached. Note: If you are using Microsoft Windows 2000, the Ultrabay Slim status indicator does not blink while an Ultrabay Slim device is being detached. Instead, a message box pops up when the process is completed; then the indicator turns off.
		Stop blinking and turn off	An Ultrabay Slim device is ready to be attached or detached.
2	Standby status	Green	The computer is in standby mode.
		Blinking green	The computer is entering standby mode or hibernation mode, or is resuming normal operation.
3	Battery status	Green	The battery is in use and has enough power. The ac adapter has charged the battery completely.
		Blinking green	The battery is being charged, but still has enough power to operate. (At regular intervals, the indicator light turns off briefly.)
		Orange	The battery is being charged, but the battery power is still low.
		Blinking orange	The battery needs to be charged. When the indicator starts blinking orange, the computer beeps three times.
4	Power on	Green	The computer is on and ready to use. This indicator stays lit whenever the computer is on and is not in standby mode.
5	Drive in use	Green	Data is being read from or written to the hard-disk drive, the diskette drive, or the drive in the Ultrabay Slim device. When this indicator is on, do not put the computer into standby mode or turn off the computer. Note: Do not move the system while the green drive-in-use light is on. Sudden physical shock could cause drive errors.
6	Caps lock	Green	Caps Lock mode is enabled. To enable or disable Caps Lock mode, press the Caps Lock key.
7	Num lock	Green	The numeric keypad on the keyboard is enabled. To enable or disable the keypad, press and hold the Shift key, and press the NumLk (ScrLk) key.
8	Bluetooth status	Green	Bluetooth is operational. This indicator is on when the Bluetooth is on and not in suspend mode.
9	Wireless status	Green	The wireless feature (the IEEE 802.11 standard) is on, and the radio link is ready for use.
		Blinking green	Data is being transmitted.