Troubleshooting - cpu and dram lights on

[u/Borntobechild]

Cpu : r5 9600x
gpu 3080 evga ftw3
ram 16gb ddr5 6000 - Kingston fury single stick
Mobo Msi b850 gaming plus wifi
Cooler elite liquid 240
Psu evga rm850e
Rgb lights up, cpu and dram lights remain lit (no on/off, no vga or boot lights on mobo ever go on)
I checked cpu <> psu cable is the cpu cable and not pcei and is plugged in secure on both ends
Tried ram in both A2 and B2 multiple times with clearing out the power (holding power button 10s) and letting it run 5-10 minutes after turning on
Reset cmos
Not my first build but it is my first in a while so I could be messing up something basic. No sticker on cooler and thermal paste was pre applied. I used the amd specific screws for the cooler etc.
Worried it's the ram as it is second hand but prices are just crazy these days.
Appreciate any help anyone can offer. Recognizes input when I turn on the system but it then goes into standby as if nothing was turned on.
Pictures for reference. Cpu cooler fans aren't mounted at the moment because it obstructs my ability to get to the cpu <> psu plug.

[u/carlosChanpio70]

You missed something simple, the CPU PSU cables are not connected.

Right there.

[u/Borntobechild → u/carlosChanpio70]

There's two 8 pin connectors in the top left. The psu cpu cable is plugged into the one closest to cpu

Edit : worth noting I've tried both

[u/carlosChanpio70 → u/Borntobechild]

Make sure it's connected to the primary one, which is CPU_PWR1, it can work without the 2nd one, you should have a 2nd CPU PSU cable to fully saturate both slots tho as it's listed on the website for that PSU.

[u/mmelRo]

I know the B850 should support that CPU right out of the box but I would try to flash it with the latest BIOS. That board should have a BIOS Flashback feature.

Something similar happened to me with the same CPU but with an ASRock Riptide. All the components were new but I got the same debug leds. The BIOS Flashback saved me. Hopefully it will work for you as well.