Apple numeric keypad keyboard caps LED not working...

Hi,
I am using numeric keypad(wired one) with my iMac, suddenly, when i switched on the machine in evening and tried tap the CAPS key and it doesn't light up but the caps lock is working perfectly fine.
I saw many posts regarding this on Apple discussions, but, none of them has worked for me.
Sometimes, i use this keyboard with Windows 7 also it is not working for that too. I tried with many other PCs including Windows or Mac but, didn't worked.
I discovered that Apple is providing protection against accidently CAPS lock with new manufactured keyboards, i bought my iMac 15 days back.
My entire work in on Mac and on the application i used to work on, i need to enter the password at almost 4 locations and with out knowing that CAPS lock is on or off, really taking a lot of time.
Can any body suggest that the problem is with the LED Bulb or what? or this a manufacturing fault? or i need to go for a new keyboard?
Your comments are really appreciated in this regard.
Regards,
MacLover

Hi, my first suspect would be a bad Keyboard.
Open System Preferences>Keyboard>Modifier keys, is Caps Lock set to No Action?
Open Keyboard Veiwer in Sys Prefs>International or Languages, do the letters switch to upper case when Caps Lock is pressed?

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