Sony VGN-B1XP Hardware Manual page 30

Light On
Data is read from or written to the hard drive.
Hard disk
Turns on when the number keys in the numeric keypad are
Num Lock active.
Turns on when the letters appear in uppercase as you type.
Caps Lock The <Shift> key lowers the case of typed characters when
Caps Lock is on.
Turns on when the screen scrolls differently (not all
Scroll Lock applications support this function).
Off
The hard drive is not being accessed.
Turns off when the alphanumeric character keys in the keypad area
are active.
Turns off when the letters appear in lowercase as you type (unless
you hold down the <Shift> key).
Turns off when the information moves across the screen normally.
n N
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Using your VAIO computer