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Windows 7: Black screen after sleep mode--why?

21 Mar 2012   #1

Windows 7 Home Premium 64bit
Black screen after sleep mode--why?

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.

My System SpecsSystem Spec

22 Mar 2012   #2

Windows 7 Home Premium 64 Bit

I still recommend following the if you have had blue screens in the past. You said you usually get a blue screen during these circumstances, and those are the best method to determine why sometimes you also get the black screen. It is highly likely the behaviors are related to each other, and this behavior usually indicates a Bug Check 0x9F: DRIVER_POWER_STATE_FAILURE crash.
My System SpecsSystem Spec
26 Jul 2012   #3

Windows 7 Enterprise x64

@s2323: he said it usually goes to the normal blue *login* screen.

My freshly installed Windows 7 laptop does this as well. The login prompt is there, just the screen stays faded-out. About half the time if I log in (ctrl-alt-delete, password, Enter) then it recovers, but if not, I can go into standby again, back out, and do that again.
Returning to standby alone never recovers the display, and locking and unlocking (using keyboard shortcuts) does not recover it; only returning from standby and logging in. Sometimes two tries (the screen will come back then fade black again.)

This is a defect with the fade-out-fade-in switching from the Desktop to the Locked screens, as once, maybe twice now I have locked then unlocked the screen and it stayed dark. I don't yet know how to fix it, but above is a usable, if tricky, workaround.
My System SpecsSystem Spec


 Black screen after sleep mode--why?

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