I am a staff engineer at Huawei Technologies USA. I design antennas for phones, tablets, and mobile hot spots. I run marathons and enjoy hiking. I restore antique automobiles and am currently searching for ways to make the internal combustion engine more efficient. I really enjoy tinkering with both electronic and mechanical devices.
Answer to "smart phone wont turn on at all?"Try removing the battery and leave it out. Then plug the phone's power cable in while the battery is out. See if the phone will power on. If it does you simply need a new battery. If it doesn't then that little bump it took killed something on the main board and it will need to go back to the store to be replaced.