I have a Mid 2012 13" MacBook Pro 2.9 Ghz i7, 750GB, and 8GB(?) of RAM. I got it from someone for cheap because it didn't turn on, but not sure if it's fixable. I'll describe some of the symptoms that I see. The MacBook simply doesn't turn on. No fan, no hard drive, no lights, no chime. When I plug in the charger the charger light is always green. The battery shows three lights on the battery light indicator, and when I plug in the charger, the fourth light starts blinking as if it's charging, but after 3 blinks, all the lights fade. So now I'll go onto what I've tried. So far, I've tried replacing the DC-In board with a certified board from iFixit. No luck. I bought a new battery online, and same results as with the old battery. To be fair, the battery was not charged, but still, if it was a problem with the battery, I would think that should not matter. I also tried resetting the SMC I think. Though by apple's description, I feel like I have to actually be able to turn on my computer on considering that it's done through a keystroke. So, let me know it this seems fixable. I feel like this thread is going to end in, "your logic board is broken". But even at that I want to know. Also there's not water damage or drops.