Caps lock button works in reverse!

Dear All,
this is my problem: the caps lock button (with green LED) on my MacBook Pro 13 "mid-2009, works in reverse! When the LED is on (green light) I type lowercase fonts, when the LED is off I type uppercase fonts!
I tried everything: booting from an external disk with different operating system from mine (I use MacOSX 10.7.5), reset PRAM, reset SMC, removed the internal battery, made test hardware, Disk Warriors, etc.. I brought the laptop at an Apple-authorized center where they tried all they know, but nothing was found.
I called Apple support and the guy suggests me to format the disk (I don't make it, and sincerely it's not seems the solution for me.
However, someone tells me something to do?
Thanks in advance for all your answers.
Ennio Busato (from Italy)

Hi,
I just followed the steps “Before resetting the SMC” and afterwards the steps to set up the SMC, BUT THE PROBLEM STAYS AGAIN.
Now, I want try to remove the internal hard disk and start with an external hard disk (or with a CD); in this mode I want to see if the problem is related to the HD/System or to the motherboard.
Thanks.

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