Original post by: Zac Head ,
This could be a few different things. The first being a battery. Depending on the computer it will not run off plugged power but only power from the battery, so if now power is going through the battery it won't come on. The second could be a port issue where you plug it in, if its damaged power may not be going through it. The third thing I can think of would be a damaged solder joint in the computer where the power leads hook up.