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What are the LED status inidcators (lights) on the LCD? - ThinkPad R51e, R52

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 Wireless statusBluetooth wireless statusNum lockCaps lockDrive in usePower-onBattery statusStandby statusUltrabay Enhanced statusBluetooth wireless statusBattery statusStandby status

Note: Some models may not have the status indicators shown above and described below.

Index numberLED indicatorLED indicator meaning
1Wireless status
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.

2Bluetooth wireless status
Bluetooth wireless status
Green:
Bluetooth wireless feature is operational. This indicator is on when Bluetooth wireless feature is on and not in suspend mode.
3Num lock
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.

4Caps lock
Caps lock

Green:
Caps Lock mode is enabled. To enable or disable Caps Lock mode, press the Caps Lock key.

5Drive in use
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 Enhanced 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.
6Power-on
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.
7Battery status
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.
8Standby status
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.
9Ultrabay Enhanced statusGreen:
An Ultrabay Enhanced device is installed and in use.
Blinking green:
An Ultrabay Enhanced device is in the process of being detached.
Turn off:
An Ultrabay Enhanced device is ready to be attached or detached.