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What are the LED status inidcators (lights) on the LCD? - ThinkPad T20, T21, T22, T23, T30

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

System status indicators

The system LED status indicators show the current computer status in different colors as listed in the table below:

Index numberLED indicatorLED indicator colorLED indicator meaning
1Drive in useGreen

Data is being read from or written to the storage device, such as the hard disk drive or a drive in the Ultrabay 2000. When this indicator is on, do not put the computer into standby mode or turn off the computer.

2Num lock GreenThe numeric keypad on the keyboard is enabled. To enable or disable the keypad, press and hold the Shift key, and then press the NumLk (ScrLk) key.
3Caps lockGreenCaps Lock mode is enabled. You can enter all alphabetic characters (A-Z) in uppercase without pressing the Shift key. To enable or disable Caps Lock mode, press the Caps Lock key.
4Scroll lockGreenScroll Lock mode is enabled. The Arrow keys can be used as screen-scroll function keys. The cursor cannot be moved with the Arrow keys. Not all application programs support this function. To enable or disable Scroll Lock mode, press the ScrLk key.
5Power onGreenThe computer is on and ready to use. This indicator stays lighted even when the computer is in standby mode.
6Battery GreenThis indicator displays green when the battery is in use and the battery has enough power. It also displays green when the AC adapter has charged the battery completely.
Blinking greenThis indicator blinks when the battery is being charged yet still has enough power to operate. At regular intervals, the indicator light turns off briefly.
OrangeThis indicator displays orange when the battery is being charged, but the battery power is still low.
Blinking orangeThe battery needs to be charged. When the indicator starts blinking orange, the computer beeps three times.
7Standby status GreenThe computer is in standby mode.
Blinking greenThe computer is entering standby or hibernation mode, or is resuming normal operation.
Note: This indicator does not blink in Microsoft Windows 2000, Microsoft Windows Me, and Microsoft Windows XP.
8UltraBay statusGreenAn Ultrabay 2000 device is installed and in use.
Blinking greenAn Ultrabay 2000 device is in the process of being detached.
Note: If you are using Windows 2000 or Windows XP, the UltraBay indicator does not blink while it is being detached. Instead, a message box pops up when the process is completed; then the indicator turns off.
Turn offAn Ultrabay 2000 device is ready to attach or detach.


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Document ID : HT037348
Legacy Document ID : MIGR-4K4PWU
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