The screen stayed black. I had rebooted the laptop without really thinking about it. Just a normal restart. I was expecting the usual logo, a few seconds of waiting, then the desktop. Nothing happened. No logo. No error. No helpful message. Just a black screen. That was the point where I stopped treating it like a minor problem. This was not a spare machine or a test box. It was the laptop I actually used. My Linux setup was on it, Windows was on the same disk, and so were the fil...