Laptop not charging and wont turn on with ac connected. dim light

My laptop was working perfectly fine until a friend wanted to use my charger on his laptop. after he used it on his laptop. I plugged it up to mines when i needed it and it wouldnt charge the light was just dim green. when i test the charger magsafe connector i see a reading so the charger is working i believe. I also replaced the dc board, battery and charger still no luck the charger lights show a faint / dim green light and thats all. The laptop was last working fine until the battery ran all the way out. So the laptop works it just wont charge or run off the charger even without the battery. I have tried all smc reset and still no luck