I got a Macbook Air from my cousin, she explained that if I could fix it I could keep it. So I tried some of the key combinations to power it on, tried unplugging the battery and powering it on with just the power adapter, tried alot and nothing worked so I thought it was the battery due to its swelling. I replaced the battery and it still doesn’t power on. There are no fans, no sounds, nothing. It doesn’t power on but does charge. Any ideas or am I screwed?