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.
The system LED status indicators show the current computer status in different colors as listed in the table below:
LED indicator color
LED indicator meaning
Drive in use
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.
The 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.
Caps 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.
Scroll 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.
The computer is on and ready to use. This indicator stays lighted even when the computer is in standby mode.
This 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.
This indicator blinks when the battery is being charged yet still has enough power to operate. At regular intervals, the indicator light turns off briefly.
This indicator displays orange when the battery is being charged, but the battery power is still low.
The battery needs to be charged. When the indicator starts blinking orange, the computer beeps three times.
The computer is in standby mode.
The 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.
An Ultrabay 2000 device is installed and in use.
An 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.
An Ultrabay 2000 device is ready to attach or detach.