I've been driving this car for a while now. Everything els seem to work fine. But one day when i try to start the car for work. It just woundn't start. with no clicking noise or notting. just a silent hiss that i hear from the engine.

Sounds like a dead battery.

First, make sure that you have a fully charged battery. If you do then start working your way through the starting circuit checking all connections for tightness. Good luck!