Your PC needs to have an ATX power supply and a BIOS update that supports power down at shutdown. NT4 also needs a change in the registry and the updated hal.dll driver installed. Check the motherboard manufacturer's web site for a BIOS update. NT4 service pack 5 (and later) includes a file called hal.dll.softex that works for most PCs. To ensure the file is installed, run the service pack self-extracting archive with the /x switch. This extracts all of the service pack files without actually applying the service pack.
The following process will install hal.dll.
Start -- Run, type X:\sp6i386.exe /x and press Enter (where X represents the location of the Service Pack). You will be prompted for a folder to hold the extracted files. Then copy hal.dll.softex to C:\WINNT\system32, rename the existing hal.dll to hal.old and rename hal.dll.softex to hal.dll (C:\WINNT represents the location of your NT4 files).
To change the registry, click Start -- Run, type regedit and press Enter. Drill down to:
HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon
If the key PowerdownAfterShutdown is present, right-click the name, click Modify, type 1 and click OK.
If the name isn't present, click New -- String Value and add PowerdownAfterShutdown with value 1.
Then quit the registry editor and reboot.
Note that if you make this registry change without having the updated hal.dll, NT4 will reboot when you choose "Shut down the computer", instead of shutting off the power.
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evtl.
http://www.loa.espci.fr/winnt/logoff/logoff.htm
oder
http://users.pandora.be/jbosman/pwroff30.zip
This action will physically power off your computer. Your hardware must support this, for example an ATX motherboard and power supply should support it, but an old AT motherboard probably doesn’t support it. You also have to have ACPI or APM enabled in your bios. And the power options must be correctly configured in the windows control panel. If Windows performs a poweroff when you do a normal windows shutdown from the start menu, then it will also work with this program.
To enable poweroff in Windows NT, you will need a hal.dll that is capable of shutting down your workstation. You can try one that's supplied with service pack 4 (or higher): hal.dll.softex
Just extract the service pack (with the /x option),
There are several machine-specific HAL.DLL’s, and you MUST extract the matching HAL*.DLL.SOFTEX from the service pack. To avoid problems when someone overwrites the good HAL.DLL with a bad one it's better to rename HAL*.DLL.SOFTEX to %SystemRoot%\System32\HALPOWER.DLL for instance, copy the line in %SystemDrive%\BOOT.INI which loads the current system, alter the description and append " /HAL=HALPOWER.DLL". Now one can choose between the two HALs and has a fallback if the new one fails.
If you like NT to automatically poweroff at shutdown, set the following registry key to 1: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\PowerdownAfterShutdown
