Status Indicators
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4 HDD
This turns on when the hard disk is being accessed.
5 Wireless LAN
This turns on when the wireless LAN is operating.
1 Num Lock
This turns on when the Num Lock key is pressed and numeric keypad is activated. 
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2 Caps Lock
This turns on when the Caps Lock key is pressed allowing capital letters to be typed without holding the Shift button down.
3 Scroll Lock
This turns on when the Scroll Lock key is pressed and screen scroll is locked. 
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6 Charge Status
This shows the power source and the battery charge status.
Green: When the battery is fully charged or the battery is not installed.
Amber: When the battery is being charged.
Off: When the computer is running on battery power without being connected to AC adapter.
7 Power
This shows the computer operating status.
On : When the computer is operating
Blinks: When the computer is in Sleep mode.
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