Asus P4B266-M - Manual (Page 65)

ASUS P4B266-M motherboard user guide 4-27
Automatic Power Up [Disabled]
This allows an unattended or automatic system power up. You may
configure your system to power up at a certain time of the day by selecting
[Everyday] or at a certain time and day by selecting [By Date].
Configuration options: [Disabled] [Everyday] [By Date]
The Automatic Power Up feature does not work if the system is
powered down by an operating system, such Windows 98, that has
Advanced Configuration and Power Interface (ACPI) support enabled.
Refer to the Glossary for a description of ACPI specification.