The fn key and movement keys on a MacBookPro 2 GHz Intel Core Duo

Question

This is my first notebook computer so it may be obvious, but I cannot figure out how to use the fn key in combination with movement keys. While the fn home (right arrow) and end keys work, if you add any other command keys, like ctrl, shift, option, cmd the fn key seems not to function. For example shift-home (fn-left arrow-shift) which should extend the selection to the beginning of the line just functions as shift-left arrow. When I attach an external keyboard everything works as it should.
Actually, having played with things a bit just now, things seem to work oddly. If I hit shift (and hold it) then fn (and hold) and then left arrow, things work as they should, but if I hit fn (and hold) then shift (and hold) and then left arrow, it reacts as though I hit shift and left arrow only.
Is this normal (if it is it is strange to me)?
MacBookPro 2 GHz Intel Core Duo   Mac OS X (10.4.6)  

Answer 1

my guess is a bug in the keyboard driver, maybe if
you report it to apple they will fix it, it looks
just like something that was overlooked during testing
That sounds like a good idea, but how does one report bugs to apple? There is nothing on the site that makes it obvious.
MacBookPro 2 GHz Intel Core Duo Mac OS X (10.4.6)