Respuesta a "Flashing question mark folder, HDD okay. Bad logic board?"It appears it can be something on the board too. Maybe a SATA controller problem? I have replaced the drive and cable in the same 2011 MacBook Pro and it gets the question mark issue. Interestingly, there’s a workaround for me. I leave it sit at the question mark for a ~2 minutes, then I reboot. On the reboot it works. My guess is something needs to be “warmed up” in my specific scenario.