Keyboard issue

I have an iBook g4 and I know it's old but all of the sudden (like literally within two seconds) some keys won't work properly and other keys enter multiple characters. For example, when pressing "z" nothing happens and when pressing "a" it comes up "1qaz" and pressing "f" "4rfv" so it's in a pattern of going diagonally.

Any advice would be so appreciated before I take this into the service desk! Thanks!