B450M-HDV R4.0 no display enabling Rebar
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=113534
Printed Date: 09 Jun 2026 at 9:38pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B450M-HDV R4.0 no display enabling Rebar
Posted By: al3ks_a
Subject: B450M-HDV R4.0 no display enabling Rebar
Date Posted: 09 Jun 2026 at 6:58pm
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Technical support request: "No Signal" issue when enabling SAM (ReBAR) - ASRock B450M-HDV R4.0 & RX 6650 XT & Ryzen 7 5700x I am contacting you regarding an issue where my system fails to output a display signal when enabling SAM (ReBAR and Above 4G Decoding). I have verified that my hardware configuration supports these features, but I am encountering a boot failure after POST despite correct settings. OS: Win 11 (Installed in UEFI/GPT mode) Driver: Adrenalin 26.6.1 (latest) Troubleshooting steps performed: Updated BIOS to latest version (11.0) Verified that Windows is on a GPT partition Disabled CSM Set "PCIe x16 Speed" to Gen3 in the AMD PBS menu manually Disabled "Fast Boot" Set "Secure Boot" to Standard mode Confirmed that I am using the latest VBIOS I could find, and driver version as I stated earlier, also updated firmware to latest. Cleared CMOS Photos: https://imgur.com/a/TlvfVbX" rel="nofollow - https://imgur.com/a/TlvfVbX https://imgur.com/a/4aaMB2p" rel="nofollow - https://imgur.com/a/4aaMB2p (here you can see it doesn't say "Not Available" but "Disabled" |
Replies:
Posted By: Xaltar
Date Posted: 09 Jun 2026 at 7:06pm
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It would seem you have already followed all the troubleshooting steps I would recommend. That said, I will list them again here: 1. Clear CMOS 2. Disable CSM then save and exit the UEFI 3. Check to ensure CSM is disabled 4. Enable "above 4g decoding" and "Rebar/SAM" 5. Save and exit If that does not work then I would open a support ticket with ASRock and inquire with them directly: https://tw.asrock.com/events/tsd.asp?kind=MB Good luck  ------------- 
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