power up engines-nothing happens :(

I haved owned a copy of lock on for around two weeks now,but sadly only been able to mess around with the mission planner and fly for about 30 minutes on it.

I've noticed that it tells you how to start up the plane in the training sortie, but when i try this myself, nothing happens.
I foresee the problem bieng the factg that i have a combined pgup, pgdown, home, end, insert & delete number pad,

Even re-configuring my keys does not help. I press my new key to start up the engines, and still get nothing..

Is there a separate key configuration that i can use/download? or do I have to use a primer or power on button to ready the aircraft.

In fs2004, you have to switch on the power and enable the fuel before starting the engines..

hoppe you are able to assist