Hello! I'm desperate for help here... My 2012 MBP has decided to die and is not booting up. It essentially shuts off if it gets moved even slightly, which is highly impractical for a laptop. Then, it takes forever to turn back on and gives no signs of life during this time (last time it shut off it took about two hours for it to react when I click the power button.) When this happens,bye only reaction I can get from it happens when the charger is connected: the orange light turns green when I press the power button but goes back to orange when I release the button. No chimes or anything. Just read. Kaput. After a while it sometimes can boot up normally and there seem to be no issues with it until it shuts off again. Background: I upgraded to El Capitan two days before this behavior started. I took the laptop to the genius bar where they changed the battery that was falling; they thought this would fix what they deemed a "battery life" issue. Yet two days later the issue persisted. Laptop has been upgraded to have SSD + second hard drive inside and 8 gb of ram. I ran the diagnostics tool a couple of days after the battery change and the system showed no errors or issues. Any ideas? My laptop is currently just sitting there, not booting up or doing anything when I try to boot it up. Any help will be greatly appreciated!