Caps Lock is not working in my mac, after pressing long time too.

May have Sticky Keys enabled by accident.

Open System Preferences / Universal Access and familiarize yourself with the Keyboard section options.

Maybe some program is pulling your leg. Try starting in Safe Mode to make sure (hold down the Shift key prior to the startup chime; only Apple system extensions will be loaded). BEWARE: WILL TAKE A LONG TIME TO BOOT, BE PATIENT.

Else there may be some physical issue with the keycap or the switch underneath. Mine broke and popped off a few weeks back and Apple wanted $800 to fix it by replacing the whole topcase. Fixed it myself by buying a spare keycap from ReplacementLaptopKeys.com:

AAAHH! just noticed you're running an older cat. Awhile back Apple had the daft idea of "protecting" us users from errant presses of the Capslock key by adding a delay to its action. ONLY on that key. So you had to hold it down for a tad longer for the action to "catch". Most annoying to us speed typists. Newer felines have done away with such stupidity. Methinks that "feature" has bit you in the bum.

I think even in newer versions of OS X there is a slight delay; just not so pronounced. My advice to get around it would be to install PCKeyboardHack and KeyRemap4MacBook - then do a couple of things:

1. Change the Caps Lock key in System Preferences > Keyboard > Modifier Keys to "None"
2. Use PCKeyboardHack to remap Caps Lock to keycode 110, the PC Application Key, which is unused on Apple keyboards.
3. Then use KeyRemap4Macbook to map that particular keycode to Toggle Caps Lock.Try selecting For PC Users > Change PC Application Key > Application Key to CapsLock.

I'm pretty sure that should get rid of the delay, which only happens when Apple is in charge of connecting the Caps Lock key to its action.

Really, though, I would personally recommend doing some much more awesome things with your Caps Lock key; it's prime keyboard real estate, and who uses caps lock anyway, except in the darkest corners of the Internet? Personally, I've remapped Caps to be Escape (for use in my text editor) when you press it by itself quickly, but to be Cmd+Opt+Ctrl+Shift when you press it with any other key. I call it the "Hyper" key, and use it to switch applications; Hyp+S = Safari, Hyp+D = email, Hyp+F = Finder... The point is, be creative, make the Caps Lock key work for you.

Oh, and the real Escape key maps to Caps Lock, so I can use it if I want to.

The previous comments were helpful, but I also use an external keyboard so I could tell that it wasn't the key because the caps function wasn't working on both of the keyboards - unlikely that the button would be broken on both. I realised that a few days ago I'd clicked 'enable slow keys' not knowing what it did, with this option selected it seems to disable the possibility of using the caps lock function.

To see if yours is enabled go system preferences > accessibility > keyboard

Hello Courcoul,

i put my mac into safe mode and it started working, but when i go onto normal mode it stops working again.
Plz what do i do now to fix it?
Thankyou
Regards Hlaxfors