So you get a ticking sound but when you put a booster battery on it with jumper cables, it starts right up? That's the easiest thing in the world to diagnose: Your battery has insuffienct capacity to run the starter OR your battery cables/clamps are bad/loose or the jumper from block to chassis is bad.

A voltmeter can show you what is going on. But that means you are using the meter under the hood when a helper turns the key to "start". By looking at voltages at the battery terminals, you can tell if its the battery and/or posts/clamps at the battery - or if it is elsewhere. When the key is turned to 'start', if battery voltage falls, it's the battery. If the battery voltage stays high, it's the cables to the starter, the block to chassis jumper, etc.

Now, one thing it CAN be is that its coincidental that putting the booster on started it - you may have a bad pulse module, starter or starter interlock switch somewhere.

IT's impossible to tell remotely all we can go on is what you type.