@mohannadfatani before thinking about replacing parts, you need to find out which once. There are no standard parts that fail when the phone gets dropped. Start by opening up the phone and check the battery. Check to make sure it is seated, charged and the contacts are properly aligned. If they are then you need to dig deeper. Follow [https://www.youtube.com/watch?v=oLSc449xV0E|this video] to disassemble your phone. Check for dislodged cables, broken components, check that the power switch is okay etc. You will need to invest in a multimeter etc. to do any further testing.Take plenty of pictures of the motherboard etc. and post those with your question. That will allow us to see what you see and possibly help you figure it out. Use [guide|21499|this guide] for that.