Dec 9, 2022
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Hello Everybody,

Sorta tech savvy but this is only my second build. Pc will turn on, fans will run but pc won’t post and nothing on screen. Mobo has codes C2,C4,12,54,59 and CPU error light on the bottom right of mobo. I have made sure all connections are good. Double checked cpu and mobo pins. Ram is seated properly. Tried G.Skill F5-5600U3636E16GX2-TZ5S and Corsair CMK32GX5M2B5600C36 DDR5 ram in 2 and 1 slot configs in all slot. Reset cmos. Made sure bios is updated to right one (F20) and still nothing. Same codes and still no post. Please help.

CPU Intel Core i9-13900K 3 GHz 24-Core Processor
CPU Cooler Noctua NH-U12A
MOBO Gigabyte Z690 AORUS MASTER EATX LGA1700
RAM Corsair Vengeance 32 GB (2 x 16 GB)DDR5-5600 CL36 Memory
Storage 2x Samsung 980 Pro 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive
GPU NVIDIA Founders Edition GeForce RTX 3090 Ti 24 GB Video Card
Case Corsair 5000D AIRFLOW ATX Mid Tower
PSU Corsair HX1000 Platinum 1000 W 80+ Platinum Certified Fully ModularATX Power Supply
 
Last edited:
Dec 9, 2022
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rma the motherboard
New motherboard same-ish issue. Wont post. Z790 mobo shows a bunch of codes, then stays on D9 / AD and VGA error light is on. Fans work, lights work, keyboard and mouse light up. Also swapped CPU for i5-13600K. Same issue. Different RAM, in different slots. nothing changes.
 
Dec 9, 2022
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Fixed!!!

Turns out old board, ram, and both CPU’s were all probably fine. Since both were K’s and have intergraded graphics clearly you’d want to use that for initial boot but that’s not the case. Only way to get it to post was with GPU in and hdmi connected. Not even display port would work. Spammed del key for a minute on a black screen and boom. It posted.
 

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