AMD Motherboards - B550m Pro4(P3.40) with Ryzen 5500GT doesn't POST

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B550m Pro4(P3.40) with Ryzen 5500GT doesn't POST

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=99668
Printed Date: 03 Mar 2025 at 8:29pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: B550m Pro4(P3.40) with Ryzen 5500GT doesn't POST

Posted By: chekh
Subject: B550m Pro4(P3.40) with Ryzen 5500GT doesn't POST
Date Posted: 02 Mar 2025 at 8:51am

Hi all.
First time building PC.
Got B550m Pro4 motherboard with sticker BIOS version P3.40 and https://www.amd.com/en/support/downloads/drivers.html/processors/ryzen/ryzen-5000-series/amd-ryzen-5-5500gt.html#amd_support_product_spec" rel="nofollow - Ryzen 5 5500GT (Cezanne) , with integrated graphics card. CPU should be supported, as per https://www.asrock.com/MB/AMD/B550M%20Pro4/index.asp#CPU" rel="nofollow - CPU support page

i got thermaltake toughpower sfx 850w as my PSU. CPU is connected using CPU cable.

got only RAM and CPU on the board. some SATA cables, connected to motherboard, disconnected on other end.

when powering on, CPU and DRAM lights turn on, then off, after what VGA and BOOT lights turn on and don't turn off.

tried both with and without HDMI cable connected. tried removing CMOS battery, waiting for 5 minutes, putting it back again.

please help me understand what might be the issue and how to fix it.