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cwacker

ATX POWER DOWN at Shutdown
As I read it is possible to add the ATX Power down feature to NT 4.0 (>= SP5) by setting the registry-key

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\Current Version\WInlogon\PowerdownAfterShutdown = 1

Well I tried it. What happens now is that when I choose Shutdown the PC reboots.


A friend of mine has exactly the same PC (with exactly same bios-parameters) where the trick is working fine.

So ... where could be the error ?

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Avatar of jhancejhance

The above setting works on SOME systems and may not be compatible with yours.  Even if your friend's system is the same, it may not have the exact hardware (especially motherboard) revision.

NT doesn't truly support power management features but there are a few basic functions that are half-heartedly supported.  The PowerdownAfterShutdown is one of those.  You might check with the manufacturer of your system or motherboard and see if they have an NT power management utility or driver for your hardware.  This is a manufacturer written NT kernel mode driver that allows some of the power management features to work, including power down under program control.

jhance is wright:
Look for hardware-vendor specific software for "Softpowerdown"
Take care that your ServicePack version is supplied by the "Softpowerdown" software.

After reapply of a NT servicepack it is very often necessary to install the
"Softpowerdown" software again, otherwise "choose Shutdown the PC reboots"

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This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.