|Apple Wireless Keyboard - second generation, aluminum slim profile - side view (Photo credit: Wikipedia)
If your wireless keyboard does not respond unless you hold the key down for an extended period of time you will find the fix in the Accessibility page of your system preferences. Right there on that page is the Keyboard on the left. When you click on it this is what shows up. See where it says Slow Keys adjust the amount of time between when a key is press and when it is activated? Turn that off. Trust me you do not want that on....ever.
- Open Preferences
- Click on Accessibility
- Click on Keyboard
- Turn off Enable Slow Keys
It took me two days to figure this out and I could not find any help...! So there you go. Let me know if this helps you.