My computer won't start, HELP!

Hi, my computer won't start, my brother in law just fixed it, and couple days later my son dropped it, I still got to use it after he dropped but when I tried to plug it in different room it didn't turn on, it makes a noise all lights turn on as if it's going to start but 2-3 seconds later stops and starts all over again, I thought it was battery I bought a new battery but it still won't turn on:(, please help, can't afford a fixing guy..p.s, power light is on and charging light is on but third sign (looks like 3 disk stalk) has no light