B450 Pro4 CSM Boot Loop
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=12430
Printed Date: 15 Sep 2025 at 12:52pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B450 Pro4 CSM Boot Loop
Posted By: Vulpie05
Subject: B450 Pro4 CSM Boot Loop
Date Posted: 13 Sep 2019 at 11:20am
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I have a B450 Pro4 motherboard (bios version 3.50), Ryzen 2200G, no discrete GPU, 16GB FlareX memory 3200C14(2x8 GB, manually timed at 3200 with fast settings), 500 GB SSD, Windows 10 Home 1903. I want to allocate 4 GB or more of memory for the Vega 8 graphics. Per the FAQ, I am supposed to disable CSM. When I disable CSM, save and quit, I get the ASRock splash screen, and then I'm back into bios, no matter how many times I save and quit. Once I revert CSM back to enable, I'm able to boot into Windows. Any ideas what I am doing wrong?
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Replies:
Posted By: cx5
Date Posted: 16 Sep 2019 at 8:54am
Good morning @Vulpie05,
Could by any change you are using MBR and hence not able to use CSM off, see https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/switch-from-legacy-mbr-disk-to-gpt-disk-with-windows-10
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