Thanks for the very good explanation of this function. I have one of the newer ATX boards with Windows 98 installed so it should "Power off" automatically. When I first installed Windows 98, the power off function did work when I did the Start -> Shutdown. After installing other software and doing other initial setup changes, the function has stopped working. I think that during this time, I probably changed some of the APM settings somewhere (BIOS, Windows???) that caused the problem. Where should I look and what should I change to get the Power Off function working again? Doug At 7/24/00 01:22 PM -0400, Oscar Viņas wrote: >The newer motherboard form factors, such as ATX and NLX, include special new >signals not present in previous Baby-AT or LPX form factors. One of them is >called PS_ON or Power_On (pin 14), the other is 5VSB or 5v_Standby (pin 9). >They both can be used to turn the power supply and the system on or off via >software. PS_ON is specially evident when you use it with an Operating >System that supports the Advanced Power Management - APM (Windows 95 and >later) or Advanced Configuration and Power Interface - ACPI (Windows 98 and >later) specifications. When you select the Shut Down option from the Start >menu, Windows automatically turns the computer off after it completes the >operating system shutdown sequence. A system without this feature only >displays a message that it is safe to shut down the PC. > >The PS_ON signal is also used to power up the system. In these form factors, >the front panel Power switch doesn't physically control the power supply's >access to the 110v AC power. Instead, the power supply's on or off status is >toggled by a PS_ON active low signal received on pin 14 of the ATX connector >FROM the motherboard. The 5VSB signal on pin 9 is always active whenever the >power supply is connected to an AC power source. The 5VSB signal provides >the power for the remote switch on the case to operate while the computer >is off and gives the motherboard a limited source of power even when off and >enabling new features to be implemented such as "Zero Voltage Modem Wake up" >or "LAN Wake up", in which a signal from a modem or network adapter can >actually cause a PC to wake up and power on. Another option is the Wake Up >Timer, which wakes up and power up your system at a predefined time for >specific application. >----- Original Message ----- > At 7/19/00 09:30 AM -0600, Bob Wright wrote: > >I believe you mean NLX form factor... ><snip> The ATX form factor moves the switching >to the motherboard, allowing for the Bios and Operating System >to control power, (ie: the motherboard can be powered down >to sleep mode or turned off). ==================================== > >From: Doug Simmons <[log in to unmask] > > I think this relates to my question on PCSOFT about Windows 98 doing the > > power off rather than display the "It is now Safe to Shutdown Your > > Computer" message. > > > > How does Windows 98 "know" that the computer is of the ATX form factor? PCBUILD's List Owner's: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>