MacBook not turning on
I got this MacBook from a friend and it had a bulged battery and dint turn on, I did a SMC reset and after a couple of tries it started but was stuck in recovery mode, I upgraded the ram to 4gb and removed the battery, i tried installing a OS from usb and it won't recognise that but It recognised a external USB keyboard and mouse, I formatted the hard drive in a windows system and after that I got a folder question mark, next Morning when I tried to turn it on it wouldn't turn on, it's was like the laptop was dead, charger shows greenlight, I tied doing SMC reset, pram reset, tried plugging in the battery, installed the original ram but no use now it just won't turn on, the charger is fine, please help. I can manage repairs, I do have a multimeter, soldering iron so I can manage logic board repair, I have worked in windows laptops but not Mac.