I have been a Mac convert for the last 18 months and am the proud owner of a Macbook 4.1 Dual Core, 2.4GHz using MAC OSX v 10.5.8. For no apparent reason, neither the Keyboard or the Touchpad respond and I end up using a Mighty Mouse and Wireless Keyboard which work perfectly ok. To make matters worse, this issue comes and go's without warning. I can go two months with everything ok, then suddenly it all stops working and then suddenly it's all ok again. It is almost as if there is a way of disabling these functions which I have inadvertently done. I have re-loaded the operating system which has not achieved anything. Any help would be appreciated. Thankyou.