any difference between "start" and "begin"?

source: AlexESLvid
# In most situations, you can use one or the other, so "The concert started at nine." "The concert began at nine." 
# When you are talking about a formal situation, "begin" is actually preferred. 
# When it comes to machines or making something start or begin, we can only use "start." So, "My car won't start." We don't say, "My car won't begin."