ThinkPad T420 Hardware Maintenance Manual page 62

Table 7. Status indicators (continued)
Indicator
11
Sleep (standby for Windows
XP) status
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Meaning
The ac power adapter is attached to the computer.
The battery status indicator is off:
The battery pack of the computer is fully charged or detached.
Green:
The computer is in sleep (standby) mode.
Blinking green:
The computer is entering sleep (standby) mode or hibernation
mode, or is resuming normal operation.