Asus P9D-I - Manual (Page 46)

2-26 Chapter 2: Hardware information
5. ATX power connectors (24-pin EATXPWR1, 4-pin CON1)
These connectors are for the ATX power supply plugs. The power supply plugs are
designed to fit these connectors in only one orientation. Find the proper orientation and
push down firmly until the connectors completely fit.
• DO NOT forget to connect the 24-pin and the 4-pin power plugs; otherwise, the system
will not boot up.
• Use of a power supply unit (PSU) with a higher power output is recommended when
configuring a system with more power-consuming devices. The system may become
unstable or may not boot up if the power is inadequate.
• This motherboard supports ATX2.0 PSU or later version.
• Ensure that your PSU can provide at least the minimum power required by your
system.