I dont think that its the battery because I just replaced the old battery, however, the new battery did not come charged so maybe that is why I cant get it to work. I put the new battery in but I dont have a wall charger only the USB cable. I ahve also tried disconnecting the battery and hard drive from the logic board for a few minutes then reconnecting them to see if that would do the trick. no go. I am thinking that it is either the HDD, the logic board, or the ribbon that connects the two. What do y'all think??