Asus P4B-MX Motherboard DIY Troubleshooting Guide - Page 38
Jumper settings
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2.7.2 Jumper settings 1. USB device wake-up (3-pin USBPWR) Set this jumper to +5V to wake up the computer from S1 sleep mode (CPU stopped, DRAM refreshed, system running in low power mode) using the connected USB devices. Set to +5VSB to wake up from S3 sleep mode (no power to CPU, DRAM in slow refresh, power supply in reduced power mode). This jumper is set to pins 1-2 (+5V) by default. This feature requires a power supply that can provide at least 1A on the +5VSB lead when these jumpers are set to +5VSB. Otherwise, the system does not power up. The total current consumed must NOT exceed the power supply capability (+5VSB) whether under normal condition or in sleep mode. USBPWR 12 23 ® P4B-MX P4B-MX USB Device Wake-Up +5V (Default) +5VSB Figure 2-22 USB Device Wake-up Settings 2-18 Chapter 2: Hardware information