AMD Motherboards - B450 Pro4 issues after BIOS update to 4.5

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B450 Pro4 issues after BIOS update to 4.5

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=18418
Printed Date: 19 Apr 2026 at 3:10pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B450 Pro4 issues after BIOS update to 4.5

Posted By: NeoTrantor
Subject: B450 Pro4 issues after BIOS update to 4.5
Date Posted: 20 Mar 2021 at 7:33pm

Hi,

because I needed the power on AC loss feature which was bugged in 3.5 I recently updated my BIOS to version 4.5.
After that the PC failed to boot and just stopped at stage A2 without any error message or speaker beeps.
As soon as I removed one specific PCIe card from the PC, the computer started again. It is an DVB-S2 dual receiver (DvbSky S952). The card is working fine in another machine and also I have another one of the same card model but of a different revision which also works fine on the B450.
Any Ideas what could be the problem here£