Asus P4B - Manual (Page 46)

2-24 Chapter 2: Hardware information
Figure 2-31 Hard Disk LED Connector
2.8 Connectors
This section describes and illustrates the internal connectors on the
motherboard.
Some pins are used for connectors or power sources. These are
clearly distinguished from jumpers in the Motherboard Layout. Placing
jumper caps over these connector pins will cause damage to your
motherboard.
Always connect ribbon cables with the red stripe to Pin 1 on the
connectors. Pin 1 is usually on the side closest to the power connector
on hard drives and CD-ROM drives, but may be on the opposite side
on floppy disk drives.
1. Hard disk activity LED (2-pin HDLED)
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.
P4B
®
P4B HD Activity LED
TIP: If the case-mounted LED does not
light, try reversing the 2-pin plug.
HDLED
Figure 2-30 Clear RTC RAM
P4B
®
P4B Clear RTC RAM
Short jumper
to clear CMOS
CLRCMOS
Intel I/O
Controller
Hub
(ICH2)