Just got my brand new black MB up and running, and four keys on the keyboard don't seem to work: the number 9, letters oh and el, and the period -- 4 keys that form a diagonal line. The only way I'm intelligibly typing this now is with an external keyboard. I first assumed the numeric keypad function was on, but I've pressed the F6 function key to no avail. Which brings up more questions: How do you activate the numeric keypad? Is F6 the function key? Why doesn't it light to indicate when its active? Which keys act as the keypad and why aren't they indicated with tiny numbers on the keys? I've only been a Mac user since 1985, and this is only my fifth Apple laptop! This is, however, my first Intel-based machine. I've done all the OS updates, and Mouse keys are off. Any ideas on what gives with my keyboard?