First as it's easy to do try clutch lever pulled in, if this works, check the clutch lever switch and plug. You will find a picture how to, at zx-9r.net in the How to section.
It may be worth turning the ignition switch on and off a few times in case it has dirty contacts.
Then it's tank off and check the big white ignition switch plug under the front of the tank. Normally it's thw white wire, or brown then grey wire.
While the tank is off check the plugs to the right handle bar, and to the left one.
For Tech Questions Bike Model letters are more useful than saying the year, for uk owners anyway, as registration year is not always year of manufacturer model.