Asus AP1720-E2 - Manual (Page 100)

Chapter 4: Motherboard info 4-12
9. Power connectors (24-pin ATXPWR1, 8-pin ATX12V1)
These connectors connect to an SSI-type 12V power supply. The plugs
from the power supply are designed to fit these connectors in only one
orientation. Find the proper orientation and push down firmly until the
connectors completely fit.
1. Do not forget to connect the 8-pin +12V power plug. Otherwise, the
system does not boot up.
2. When using Intel ® Xeon™ 800 MHz processor, make sure that your
power supply can provide a total of 27A, minimum of three +12V
output leads and at least 1A on the +5V standby lead (+5VSB).
3. The minimum recommended wattage is 600W. The system may
become unstable or may not boot up if the power is inadequate.
10. Hard disk activity LED connector (2-pin IDELED1)
This connector supplies power to the hard disk activity LED. The read
or write activities of any device connected to the primary or secondary
IDE connector cause this LED to light up.
NCCH-DL
®
NCCH-DL IDE activity LED
TIP: If the case-mounted LED does not
light up, try reversing the 2-pin plug.
IDE_LED
NCCH-DL
®
NCCH-DL ATX power connectors
For power supply
with 20-pin
power connector
24-pin power connector 8-pin power connector
+3V +3V
Ground
+5V +5V
Ground Ground
Power OK
+5V Standby
+12V3
-5V +5V +3V -12V Ground Ground Ground PSON# Ground +5V
+12V3
+3V
+5V Ground
GND
12V2
GND
12V2
GND
12V1
GND
12V1