My Toshiba Satellite L50 - B931 is about 2 years old and a few months ago it started to take longer to boot up, like 10 minutes or so and then it started to take much longer from like an hour to 3/4 hours, and during that time the screen was off but the power button was lit up and when it did turn on, the Toshiba logo came up and then Windows booted up like normal. There was a Windows update which I started to download, it said my laptop will restart so it turned off and then it turned on again, the same thing happened. I left it to do its job but it turns off by itself after a while. I tried again and again but it doesn't turn on. The screen isn't turned on but the power button is lit up.