Why won't my screen turn on

Hi, I drop my phone a couple of times and it hasn't cracked at all but yesterday I was on Facebook and the whole screen turn blue and stop working it got it to turn back on but it turn right back off it did it a couple of times it will start and turn on the start then it will shut down and turn on by itself with me touching it . I don't know what's wrong with it I reset it and it load for a while and not turn back on it was fully charge but it's not right now I don't know what happen can you help me please is something wrong with the battery or screen