MacBook Air 11" (Late 2010) keyboard input problem

The keyboard on my MBA has started to act weird lately - pressing certain keys will produce different results than that intended.
For example:
Pressing the "UP" cursor/ arrow key will MUTE the system's sound;
Pressing the "RIGHT" cursor/ arrow key will, in addition to its usual effect of skipping a space (like the effect of pressing a spacebar), the track playing on iTunes will be also skipped to the next track;
Pressing the "`" key (the one immediate above the "Tab" and below the "Esc" keys) will TURN UP the brightness of the screen!
I have formatted my harddrive and reinstalled OS X 10.8.3 from fresh but that didn't solve the problem.
What could be the cause and any known solution?
Thanks.
AC

Sounds like it cound be. While they should not be involved, try resetting the system's PRAM and SMC, to see if those help anyting:
Reset PRAM: http://support.apple.com/kb/ht1379
Reset SMC: http://support.apple.com/kb/ht3964
If this does not help, then given that it's persisting even after a fresh install suggests you should take it in for servicing, as it could very well be a firmware fault or other hardware-based issue.

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http://support.apple.com/kb/PH14204?viewlocale=en_US
Repair Disk
Steps 1 through 7
http://support.apple.com/kb/PH5836
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Manufacturer:    DP
Device Name:    bq20z451
Pack Lot Code:    0
PCB Lot Code:    0
Firmware Version:    301
Hardware Revision:    1
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Fully Charged:    Yes
Charging:    No
Full Charge Capacity (mAh):    0
Health Information:
Cycle Count:    6
Condition:    Replace Now
Battery Installed:    Yes
Amperage (mA):    0
Voltage (mV):    5104

mattk68
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So it was always plugged in, never discharged, and was never really OFF, just in sleep mode.
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what they didnt tell you is "plugged in and OFF is one thing.......plugged in ALL THE TIME...AND in sleep mode (for years)......NO!"
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