New Member AMD Motherboard Thread

I have created a thread for you here.

Welcome to the forums PO_Customer, I have made a thread for you here.

Hello and welcome to the forums Minger. I have made a thread for your question here.

Welcome to the forums relytgerg, I have made a thread for your question here.

Board: ASRock B650M-CX R2.0
BIOS version: 3.50

Issue: System hangs at POST when certain USB devices are plugged in during boot. Symptom is either the ASRock logo hanging with no spinner, or a black screen with a blinking white underscore (no bootable device found).

Devices involved:

Fujitsu ScanSnap scanner (USB 2.0)
NexiGo webcam (USB 2.0)

Troubleshooting so far:

1. Disabled Quick Boot - no change.
2. Confirmed via boot menu that only "Windows Boot Manager" is listed as Boot Option #1 - no separate USB boot entry, so this isn't a boot-order issue.
3. USB Configuration screen shows: 4 USB Controllers, 2 Keyboards + 1 Hub detected, XHCI Hand-off: Enabled, USB Mass Storage Driver Support: Enabled.
4. Tried disabling USB Mass Storage Driver Support - no change with ScanSnap alone. Reverted.
5. Disabled XHCI Hand-off - this fixed the hang when only the ScanSnap is plugged in.
6. With XHCI Hand-off still disabled, plugging in both the ScanSnap and the NexiGo webcam together (both on USB 2.0 ports) reproduces the same hang.
7. Tried moving the webcam to a different physical USB port - no change.
8. No "Legacy USB Support" option exists in this BIOS version's USB Configuration screen.

Question: Is this a known issue with this board/BIOS version? Is there a BIOS setting I'm missing that controls USB enumeration timeout/behavior with multiple devices at POST? Also considering updating from 3.50 to the latest 4.43 (AGESA ComboAM5 1.3.0.1b Patch A), would that changelog be expected to touch this kind of behavior, or is it unrelated?

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Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 41703	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 13 Jul 2026 at 12:53pm
	Hello and welcome TyESt, please make your post here and I will move it to it's own thread.


Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 41703	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 15 Jul 2026 at 11:20am
	I have created a thread for you here.


Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 41703	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 17 Jul 2026 at 5:56pm
	Welcome to the forums ztilleto, I have made a thread for your issue here.


Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 41703	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 22 Jul 2026 at 7:01pm
	Welcome to the forums PO_Customer, I have made a thread for you here.


Minger Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Jul 2026 Location: Toronto Status: Offline Points: 45	Post Options Post Reply Quote Minger Report Post Thanks(0) Quote Reply Posted: 31 Jul 2026 at 5:35am
	I have created an account and would like to post a question regarding updating BIOS for x470 Master SLI/ac as I plan to upgrade from 7 2700 to 7 5800xt. How do I go about posting my question? Thanks in advance and apologies for anything I have missed.

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 41703	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 31 Jul 2026 at 1:01pm
	Hello and welcome to the forums Minger. I have made a thread for your question here.


Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 41703	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 06 Aug 2026 at 1:25pm
	Welcome to the forums paranoidandroid, I have made a thread for your issue here.


Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 41703	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 12 Aug 2026 at 1:18pm
	Welcome to the forums relytgerg, I have made a thread for your question here.


Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 41703	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 21 Aug 2026 at 9:33pm
	Hello and welcome to the forums Alex M. I have made a thread for your question here.


omnipotato Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 3 hours 45 minutes ago Status: Offline Points: 15	Post Options Post Reply Quote omnipotato Report Post Thanks(0) Quote Reply Posted: 3 hours 34 minutes ago at 4:17am
	Board: ASRock B650M-CX R2.0 BIOS version: 3.50 Issue: System hangs at POST when certain USB devices are plugged in during boot. Symptom is either the ASRock logo hanging with no spinner, or a black screen with a blinking white underscore (no bootable device found). Devices involved: Fujitsu ScanSnap scanner (USB 2.0) NexiGo webcam (USB 2.0) Troubleshooting so far: 1. Disabled Quick Boot - no change. 2. Confirmed via boot menu that only "Windows Boot Manager" is listed as Boot Option #1 - no separate USB boot entry, so this isn't a boot-order issue. 3. USB Configuration screen shows: 4 USB Controllers, 2 Keyboards + 1 Hub detected, XHCI Hand-off: Enabled, USB Mass Storage Driver Support: Enabled. 4. Tried disabling USB Mass Storage Driver Support - no change with ScanSnap alone. Reverted. 5. Disabled XHCI Hand-off - this fixed the hang when only the ScanSnap is plugged in. 6. With XHCI Hand-off still disabled, plugging in both the ScanSnap and the NexiGo webcam together (both on USB 2.0 ports) reproduces the same hang. 7. Tried moving the webcam to a different physical USB port - no change. 8. No "Legacy USB Support" option exists in this BIOS version's USB Configuration screen. Question: Is this a known issue with this board/BIOS version? Is there a BIOS setting I'm missing that controls USB enumeration timeout/behavior with multiple devices at POST? Also considering updating from 3.50 to the latest 4.43 (AGESA ComboAM5 1.3.0.1b Patch A), would that changelog be expected to touch this kind of behavior, or is it unrelated?