[SOLVED] B450 tomahawk NON max + ryzen 7 5700x3D not POSTing

[Mega19]

Hello, good day

i got myself a R7 5700x3D to upgrade from my R7 3700x for my machine, and use it on my B450 tomahawk (non max ver.)

Before anything i updated my MB BIOS to the latest beta as it appeared on the CPU compatibility listed on the official product page, version is "7C02v1J5(Beta version)".

BIOS update went fine, version appears on the BIOS information i and thought, "im set lets change it"
the installation went smooth, no bent pins on new CPU changed, removed cooler, clean up, re-apply paste, etc.

Moment of truth comes by, i turn on the machine with the new CPU, lights turn on, none of the MB error LEDS stay on so i thought i was clear but then simply no POST, its all a black screen...

i waited for approx 10-15 minutes... nothing. still black, restarted and still nothing. all black, In the end i switched back to my 3700x
machine boots just fine with no hiccups, and so i come here to ask for guidance before i possibly take the wrong decision

Im just really hoping this is not the second DOA cpu i buy...

Machine specs are as follow:
CPU: R7 3700x -> upgrading to R7 5700x3D
GPU: RTX 3060 Ti
MB: b450 tomahawk (non MAX)
RAM: Corsair vengeance LED 2x8 (16GB) 3200mhz
PSU: seasonic focus GX 850W
Storage: NVME Western digital blue SN580 1TB, SSD Crucial MX500, Seagate HDD 1TB

 

[Mega19]

Thanks for your answer I will try this as well and fingers crossed! Also, did you notice any perfromance drops (i.e., the CPU not boosting properly or lower benchmarks scores) due to the older Bios version that theoretically is before the 5700X3D release?

i have not ran any benchmarks on this CPU, but on regular use in games i have not seen drops in performance, just increases, for example FFXIV no longer struggles to keep consistent 60 FPS, the 3700x could barely keep 45 frames in heavily player populated areas