AMD Motherboards - Disabling ErP support on B450M Pro4

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Disabling ErP support on B450M Pro4

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=10933
Printed Date: 27 Jul 2025 at 6:23am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: Disabling ErP support on B450M Pro4

Posted By: DrMacintosh
Subject: Disabling ErP support on B450M Pro4
Date Posted: 21 Feb 2019 at 3:43pm

Hello, so I know that most boards these days send power even though the rest of the computer is turned off. This is often called "ErP"

With previous systems I would disable this feature to ensure that my USB microphone and my power LED would turn off once I shut down the computer. (my power LED is unique since my system is built inside a PowerMac G5 case with a modified front panel.My powerLED is a modified G5 PoweMac front panel that functions using a special cable that functions like this: https://imgur.com/a/eLw5tCg . The cable uses the + pins for the power switch and front panel LED.)

With my ASRock B450M Pro4 however, I can't seem to find any ErP settings. I know that the "Deep Sleep" setting in the BIOS is supposed to do what I want, however even with Deep Sleep enabled, my Mic and power LED remain lit after shutting down.

If anyone knows how I can disable ErP support, or a setting that will make the power LED turn off at shutdown, I would be extremely appreciative.