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C5 code on B650D4U |
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Dai 
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Joined: 18 Feb 2024 Status: Offline Points: 20 |
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 Topic: C5 code on B650D4UPosted: 18 Feb 2024 at 2:17am |
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I just picked up a B650D4U to build a server with. When I turn it on, it doesn't fully POST. Looking at the Dr. Debug codes, I see 15 followered by C5 where it stops. Never get VGA output though it'll take the display out of low power mode, nothing ever comes up just black screen.
The manual doesn't list C5, but says 15 is something like northbridge init. |
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kerberos_20
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Joined: 06 Dec 2017 Location: czech republic Status: Offline Points: 3687 |
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Posted: 19 Feb 2024 at 5:08am |
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C5 should be memory related error, try shuffling single ram stick in different slots
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mariusleu
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Joined: 12 Jun 2025 Status: Offline Points: 15 |
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Posted: 12 Jun 2025 at 3:58am |
Hi, I got the same issue. What was the cause and how did you fix it? Thanks. |
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mmpn
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Joined: 14 Jun 2025 Status: Offline Points: 45 |
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Posted: 14 Jun 2025 at 9:50am |
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We have 5 new B650D4U boards 2 from vendor A, 3 from vendor B. Vendor B boards have this C5 issue after upgrading bios to 20.05 in order to support Epyc 4005/Ryzen 9000.
Swapping the memory from from a functioning A board to B boards, the issue appears inherent to the batch of B boards. If anyone has resolution/other on this, it would be appreciated. |
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intuego
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Posted: 11 hours 16 minutes ago at 5:12am |
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do u find any solution, ve the same issue. Resetting fix it
Dimms are new . also change with other dimms but same result 4564p 192gb 48gb dimm x 4 |
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mmpn
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Posted: 11 hours 11 minutes ago at 5:17am |
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reach out to support to get a beta version of the bios, that fixed it for us.
I'm surprised you are having the issue with a 4004/7000 cpu, I thought it was due to the new gen 4005/9000 cpu. |
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intuego
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Posted: 11 hours 3 minutes ago at 5:25am |
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thanks !
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intuego
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Posted: 11 hours 2 minutes ago at 5:26am |
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Is there a change to post it here so i can grab it ?
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mmpn
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Posted: 10 hours 58 minutes ago at 5:30am |
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not permitted to, you have to get it from them directly.
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Dai wrote: