Is it possible that his type of mobo doesn't want him overclocking at all? Still seems weird...
When you go to change it, do you actually hit ENTER to pick a number or use the + and - keys? I've seen where people hit ENTER to pick a number and the screen won't load right. Try using + and - and tell us what happens. Also, you'll need to lower the HT multiplier when you raise the FSB. Look at the overclocking guide to find out what to do with it, or just search tech-forums for it (we've answered this in the past).
EDIT: By the way, I meant the + and - keys on the number pad. Make sure your numlock is on if it isn't working that way too.
When you go to change it, do you actually hit ENTER to pick a number or use the + and - keys? I've seen where people hit ENTER to pick a number and the screen won't load right. Try using + and - and tell us what happens. Also, you'll need to lower the HT multiplier when you raise the FSB. Look at the overclocking guide to find out what to do with it, or just search tech-forums for it (we've answered this in the past).
EDIT: By the way, I meant the + and - keys on the number pad. Make sure your numlock is on if it isn't working that way too.