numbers on right side of keyboard do not function

[sproggy]

I'm running 10.2.8 and the numbers on the right-side extended part of the keyboard do not work. I've toggled on and off the "block number" key to no avail. Incidentally, the plus, minus, division (+-/) keys do work. Under OS 9 they all function normally so it is not a problem with the keyboard. Any ideas what the prob. could be?
Thanks folks.

 

[sproggy]

G4 733 mghz

Just wanted to add this is a G4 733 mghz computer