I'm not sure if this counts as a crash, but please bear with me here.
I have a Sony Vaio VPCSB11FX/W laptop. I lock the screen (it's password protected too) and close the lid when I need to get up to do something else while using it. Usually, the blue Windows 7 lock screen shows up when I open the laptop, but just now, I got a black screen that wouldn't respond to any buttons, so I shut the laptop down manually by holding down the power button. When I booted up and logged in, I got the old 'Windows was shut down unexpectedly' message.
Just curious, why did I get the black screen? Also, the power button was green, which means it wasn't in sleep mode at all, and the laptop's fan was whirring loudly too. This has happened to me a couple of times before, and I usually wait at least 30-60 seconds for the black screen to respond before shutting down, though the fan makes a louder noise the longer I wait. This happened even though the lid was closed properly. I'm hoping you guys can give me some advice on how to prevent this from happening in the future, please and thank you.