Again, remember that as long as the motherboard is ACPI-compliant and listed as approved hardware in the Microsoft HCL, then leave ACPI ON by setting "PnP OS Installed = Yes" in the BIOS Setup Utility. In the case where ACPI is deactivated in the BIOS then ALL Power Management should be completely disabled in the BIOS as well. Windows 2000 does not have well implemented support for legacy systems versus fully PnP compliant systems. Disabling or setting this value to "No" in effect converts the motherboard from ACPI-compliant which is a Plug-n-Play system to APM-compliant which is not a Plug-n-Play system and is instead considered now a legacy system by Windows 2000. Since the motherboard has been tested and approved by Microsoft then it's ACPI implementation is 100% generic and compliant with the standard and the Microsoft ACPI support built into Windows 2000 should work. Enter the BIOS and be sure that the entry that reads something similar to "PnP OS Installed = Yes|No" is set to "Yes". (Unlisted hardware should only be used for non-critical applications like learning how to install and configure Windows 2000) If it is not then Windows 2000 Server should not be installed on it. The motherboard must be approved and listed there. To determine if the motherboard is compatible search the Microsoft HCL. The problem is whether the motherboard's implementation of any of these technologies is completely compatible with the Windows 2000 drivers including how to determine this and what to do about the situation if the motherboard's implementation of APM, ACPI, or APIC is suspect or obviously not compatible. APM however is not a Plug-n-Play technology and could theoretically cause more trouble than either of the other two. Contrary to what some believe, Windows 2000 is ACPI and APIC compatible.
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