C5 error in LED on boot

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   Hi,

I have 
Motherbard - PHANTOM GAMING X870E Nova WiFi(3.10 bios)

CPU -9800X3D
Ram: GSkill - F5-6000J3036G32GX2-TZ5NRW
Case: Lian-li O11 dyanmic evo

The system stops briefly at code 15 and stops completely at C5 afterwards. This is in combination with different memory slots. Without RAM, it errors AA.
According to GSkill, this board is supported for this RAM.
Front Panel controls also do not work.

Thank you

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sys_builder Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Mar 2025 Status: Offline Points: 35	Post Options Post Reply Quote sys_builder Report Post Thanks(0) Quote Reply Topic: C5 error in LED on boot Posted: 31 Mar 2025 at 8:19pm
	Hi, I have Motherbard - PHANTOM GAMING X870E Nova WiFi(3.10 bios) CPU -9800X3D Ram: GSkill - F5-6000J3036G32GX2-TZ5NRW Case: Lian-li O11 dyanmic evo The system stops briefly at code 15 and stops completely at C5 afterwards. This is in combination with different memory slots. Without RAM, it errors AA. According to GSkill, this board is supported for this RAM. Front Panel controls also do not work. Thank you

sys_builder Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 31 Mar 2025 Status: Offline Points: 35	Post Options Post Reply Quote sys_builder Report Post Thanks(0) Quote Reply Posted: 31 Mar 2025 at 8:21pm
	I have reseated the cpu and graphics card. The pins look ok.

M440 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 12 Jul 2023 Status: Offline Points: 3470	Post Options Post Reply Quote M440 Report Post Thanks(0) Quote Reply Posted: 31 Mar 2025 at 9:59pm
	what does your mb manual says about this code?
	asrock b650m/hdv.m2, ryzen 7700x@85watt

NDRE28 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 08 Sep 2024 Location: Romania Status: Offline Points: 1455	Post Options Post Reply Quote NDRE28 Report Post Thanks(0) Quote Reply Posted: 22 hours 34 minutes ago at 11:24am
	Hi! Both C15 & C5 are related to memory issues. C15 = Memory training. C5 = Memory incompatibility. I have dealt with C5 too. I had a very niche memory kit, and it would give me error C5. What worked for me was putting both RAM DIMMs in channel B (B1 + B2), however that means that it will run in single-channel mode. You can try this setup to see if you can boot with it. In my case, I've ended up RMA'ing the RAM kit. I hope this helps...

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25813	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 15 hours 57 minutes ago at 6:01pm
	Thanks NDRE28, you are correct. The issue is most likely related to the RAM. Try reseating the RAM and ensuring it is fully seated in the slot. On new boards the slots can be very tight and seem like they are seated but actually still need to go in a bit further. Good luck