Definitely a starting system problem. That sound you hear in the back is the fuel pump.
Starting system circuit components (besides wiring harness)
1. Ignition Key Switch - closes the starter relay control circuit to energize the relay and close the contacts inside the relay (you can check this by locating the relay in the underhood fuse/relay box and have a friend turn the key while you listen/feel if the relay 'clicks'
2. Starter Relay or its Contacts
3. Starter Solenoid - pushes/pulls the starter gear into the engine's flywheel ring-gear and its contacts close to provide battery power to the starter itself.
4. Starter itself - poor brush contact with the armature's commutator will prevent the starter to spin/turn
If you are 'Electrically' talented, you can check to see if you're getting battery power to the starter solenoid by using a simple 12 volt test light/bulb. Connect one lead to the starter solenoid terminal and the other to chassis/engine ground and have a buddy turn the ignition key - if the light turns 'ON', then you know that particular circuit is OK but the starter solenoid is not energizing to push the starter gear into the flywheel ring-gear to turn the engine over. If it doesn't, the problem is elsewhere (wiring, starter relay, starter relay control circuit, etc).
You can have a qualified Hyundai Service Technician properly diagnose your vehicle. OR, you can Go to www.hmaservice.com
and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, illustrations, etc.