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x399 and error B4

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=8236
Printed Date: 25 May 2024 at 6:12pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com


Topic: x399 and error B4
Posted By: Alexander_An
Subject: x399 and error B4
Date Posted: 30 Mar 2018 at 4:36pm
Hi!
When you boot the bios, the computer shuts down on dr.doctor last value b4. Only the keypad is connected.
Taichi x399 + 1950x + 4x8 Hyperx Predator 3333



Replies:
Posted By: TANWare
Date Posted: 30 Mar 2018 at 4:59pm
" rel="nofollow - Is this a new system build? Also you do have the CPU and all four memory chips, what about drives, video card mouse and monitor? Lastly I imagine there must be a PSU to power it too.
 
Also since this usually is a USB error, unplug all USB device(s) and even try unplugging all headers on the main board as well.


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x399 Taichi, 1950x, 32GB 3466 DDR4
2x500GB 960EVO,Asus 1080TI
http://www.pcambrosia.com/images/PassmarkEVO960_e.jpg" rel="nofollow - Passmark


Posted By: Alexander_An
Date Posted: 30 Mar 2018 at 5:33pm
Yeah, it's a new build. Graphics card and power supply (fsp 800w) from the old computer. SSD, HDD and mouse are not connected. Disabled everything except the graphics card. If you do not connect the keyboard, the error d7. If you connect a keyboard error b4


Posted By: TANWare
Date Posted: 30 Mar 2018 at 9:19pm
" rel="nofollow - So with the mouse error D4 as well? Also does the keyboard initialize? if not maybe the keyboard has an error. Again please be sure all USB headers form the case are unplugged too.

-------------
x399 Taichi, 1950x, 32GB 3466 DDR4
2x500GB 960EVO,Asus 1080TI
http://www.pcambrosia.com/images/PassmarkEVO960_e.jpg" rel="nofollow - Passmark


Posted By: Alexander_An
Date Posted: 30 Mar 2018 at 10:53pm
" rel="nofollow - When you connect one of the mouse error d7. No other USB devices are connected. In this case, the flash C USB upgrade is successful. Is the 800 Watt power supply enough?


Posted By: TANWare
Date Posted: 30 Mar 2018 at 11:29pm
Not that a device is connected, but the USB headers off the motherboard connecting to the case etc. If there is a short somewhere could be the issue. Also some cases have a multi-port output from a single connection meaning it is working as a USB expander and could be erring.
 
Make sure the keyboard and mouse are only plugged into the built on ports on the back of the board.


-------------
x399 Taichi, 1950x, 32GB 3466 DDR4
2x500GB 960EVO,Asus 1080TI
http://www.pcambrosia.com/images/PassmarkEVO960_e.jpg" rel="nofollow - Passmark


Posted By: Alexander_An
Date Posted: 31 Mar 2018 at 2:58pm
Internal USB connectors are not connected to the motherboard. Sometimes bios is loaded, then you can connect the keyboard and mouse, everything works. After connecting the UTP to the LAN and activating the BIOS update feature, the computer shuts down completely.
Is the 800 W power supply from FSP enough?
http://article.tech-


Posted By: TANWare
Date Posted: 31 Mar 2018 at 5:48pm
" rel="nofollow - The PSU spec's seem fine, I can not vouch though for the manufacturer. I myself have not tried to update over LAN so I can not vouch for that procedure either. If none of the main board headers are connected then the case ports should not be the issue.
 
Since hot plugging works while in bios on the USB devices it should not be them either. Since you are trying to update the bios what version are you presently on?


-------------
x399 Taichi, 1950x, 32GB 3466 DDR4
2x500GB 960EVO,Asus 1080TI
http://www.pcambrosia.com/images/PassmarkEVO960_e.jpg" rel="nofollow - Passmark


Posted By: Alexander_An
Date Posted: 31 Mar 2018 at 5:59pm
" rel="nofollow - BIOS I updated to the latest version 2.00 via USB-FLASH.
Important note: if you experience b4 or d7 errors, your computer shuts down. The reset and power buttons shine on the Board. A full power outage is required to restart.
I think the problem is in the power supply, in separate 12V lines.
What power supply do you have?


Posted By: TANWare
Date Posted: 31 Mar 2018 at 10:38pm
Mine; https://www.newegg.com/Product/Product.aspx%3cItem=N82E16817438062" rel="nofollow - https://www.newegg.com/Product/Product.aspx?Item=N82E16817438062

-------------
x399 Taichi, 1950x, 32GB 3466 DDR4
2x500GB 960EVO,Asus 1080TI
http://www.pcambrosia.com/images/PassmarkEVO960_e.jpg" rel="nofollow - Passmark


Posted By: wardog
Date Posted: 01 Apr 2018 at 2:22am
b4 and d7 are BOTH errors relating to KB's and or Mice. USB in particular.






Posted By: Alexander_An
Date Posted: 01 Apr 2018 at 5:01pm
The mouse turned off, keyboard was replaced by a new Logitech K208e. Motherboard still disabled when loading, the last value on dr.debug-b4. When the motherboard is switched off, the reset and power buttons remain lit. To restart the motherboard requires disconnecting the power supply from the mains 220V.

The motherboard was handed over to the service center.



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