The Surface pro was dead after change the battery, many people found the same thing, not only turn on problem many of them found touch function also failure. The trick is after put new battery in place you must insert plastic sheet to isolate battery until the mainbord sit on the right position then you pull the plastic sheet, the terminals of battery and mainboard will connect to the right place. The failure of battery replacement mostly come from the battery terminals connect to the wrong pins of mainboard during moving mainboard to make it sit on right position.