Mid-2012 MBP. The only custom part I have is a 256gb SSD. The default partition that the computer boots to is bootcamp. Basically, I let the battery die by accident when I forgot to plug the charger in. I plug it back in, boot up and it's fine the first time. Computer crashes almost immediately after and now every time I turn it on, I get a white screen. If I load into Mac partition, it gives me Internet recovery and asks me how I'm going to reinstall the os. If I boot into boot camp, I get a black screen telling me the bootloader is non-existent and to put in a recovery disk.