X870 not POSTing on new build
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=99016
Printed Date: 31 Oct 2025 at 5:38pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: X870 not POSTing on new build
Posted By: djoeh
Subject: X870 not POSTing on new build
Date Posted: 24 Feb 2025 at 5:17pm
I just made a new build with the X870 pro rs wifi MB, and the red+yellow lights come on to indicate a problem with the CPU or DRAM.
CPU: Ryzen 7 9700x
RAM: G.Skill DDR5 5200 16G installed in slot A2
PSU: be quiet! 1000W
MB is getting power in both 8-pin slots as well as the 24-pin slot.
I've tried flashing a new BIOS version in the hopes that might fix things but I wasn't able to confirm that I had done that correctly, as the flashback light did not come on as I pressed the button.
I'm wondering if there's any potential BIOS issues with the CPU I chose or if I'll have to go through some troubleshooting to see if my CPU or RAM is dead on arrival.
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Replies:
Posted By: djoeh
Date Posted: 24 Feb 2025 at 5:40pm
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If it helps, the serial number of my G.Skill RAM is F5-5200J3636C16GX2-RS5W
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Posted By: djoeh
Date Posted: 25 Feb 2025 at 4:46pm
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An update: Everything works now. I made a mistake in updating the BIOS, turns out that my parts don't work on version 3.11. I rolled back all the way to 3.06 and the system POSTS just fine, now dual booting Windows 11 and Ubuntu 24.04. Instead the issue was that my monitor didn't support input from my MB. With a new monitor things are working just fine. Hoping things continue to work, given that my DRAM isn't actually on the QVL list. I guess you never trust PCPartPicker to check QVL lists...
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Posted By: meryjane82
Date Posted: 26 Feb 2025 at 6:16am
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It is like a BIOS compatibility issue might be at play, especially if the flashback light didn?™t come on. You might want to double-check that the BIOS update process was done correctly?”sometimes using a smaller USB drive and formatting it to FAT32 helps. Also, trying a single stick of RAM in different slots could help rule out memory issues https://moonphasesoulmate.com/" rel="nofollow - https://moonphasesoulmate.com/ .
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