Bring Back a Laptop That Stays Black After Sleep

A black screen with a responsive disk is often only the display. **Ctrl+Alt+Del** forces a redraw, and a short power press sends a proper wake event instead of a reset.

# press Ctrl+Alt+Del once
# press the power button for one second, not five
Get-CimInstance Win32_OperatingSystem | Select-Object LastBootUpTime
powercfg /lastwake

A hard reset is the last resort, but it does leave a record. Event **41** with no bugcheck tells you the machine never completed the wake.

# hold the power button for 10 seconds, then start again
Get-WinEvent -FilterHashtable @{LogName='System';Id=41,107,42} -MaxEvents 10 | Select-Object TimeCreated,Id,ProviderName,Message | Format-List
powercfg /a

**powercfg /lastwake** names the device that woke the machine. A graphics or chipset device that cannot resume leaves the screen black while the system runs.

powercfg /lastwake
powercfg /devicequery wake_armed
Get-PnpDevice -Class Display,USB | Where-Object Status -ne 'OK' | Select-Object FriendlyName,Status,Problem
Get-CimInstance Win32_VideoController | Select-Object Name,DriverVersion,DriverDate

A monitor or panel that powers down its input needs a moment the driver does not give it. Disabling the display's power saving on wake is the standard fix.

Get-NetAdapterPowerManagement -Name 'Wi-Fi' -ErrorAction SilentlyContinue | Select-Object AllowComputerToTurnOffDevice
Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\GraphicsDrivers' | Select-Object TdrLevel,TdrDelay
Get-ItemProperty 'HKLM:\SYSTEM\CurrentControlSet\Control\Video' -ErrorAction SilentlyContinue | Select-Object * -ExcludeProperty PS*

Wake failures are usually fixed in the platform firmware or the graphics driver, not in Windows. Check both before changing power settings.

Get-CimInstance Win32_BIOS | Select-Object SMBIOSBIOSVersion,ReleaseDate
Get-CimInstance Win32_VideoController | Select-Object Name,DriverVersion,DriverDate
Get-CimInstance Win32_PnPSignedDriver | Where-Object DeviceClass -eq 'DISPLAY' | Select-Object DeviceName,DriverVersion,DriverDate

One successful wake proves little. Three cycles with a working screen and a network connection is the evidence that the change held.

for ($i=1; $i -le 3; $i++) { rundll32.exe powrprof.dll,SetSuspendState 0,1,0; Start-Sleep -Seconds 25; Get-CimInstance Win32_OperatingSystem | Select-Object LastBootUpTime; Get-NetAdapter -Name 'Wi-Fi' | Select-Object Status }
powercfg /lastwake