Question B550 and Ryzen 5600x no post.. help

[Handedextras]

I have a ryzen 5600x, gigabyte aorus elite ax v2 and Kingston fury ddr4 3600mhz. I have updated the bios and is currently on version f10, I tried f13 too but the result was the same.

I have tried the 5600x on someone else’s board and it posts.
I have tried a 2700x in my board and it posts and used this to verify my bios flashes are working.

However when I put my stuff back together there is no post.. please help.
tried resetting cmos I don’t know how many times and reseating ram etc but no luck.

 

[drea.drechsler]

What indications are you getting? fans, lights etc. Especially trouble lights or, if your board doesn't have them, do you have access to a system speaker you can connect to capture beep codes at POST failure.

Try one DIMM at a time in all slots.

And rest of system specs, brand model including PSU.

Is the 5600X brand new and out of the box?

 

[Handedextras]

All board lights, if I connect a fan it spins, gpu light and fan.
Unfortunately, I have no access to a speaker and the board doesn’t have a error light to be able to tell me.

CPU, motherboard and ram are new out of box. Only change has been a bios flash, which was done using a 2700x.
specs:
Motherboard- gigabyte b550 elite ax v2
CPU - Ryzen 5 5600x
GPU- gtx1080ti
Ram- Kingston fury ddr4 3600mhz
Power supply- Corsair rm1000x

 

[drea.drechsler]

...
CPU, motherboard and ram are new out of box. Only change has been a bios flash, which was done using a 2700x.
...

Did you reset CMOS after the flash?

 

[Handedextras]

Did you reset CMOS after the flash?

Yeah reset I don’t know how many times, both by shorting cmos pins and removing the battery for 10 minutes

 

[cepotts86]

I had a similar situation when I built my PC earlier this year. Turns out the issue was that the motherboard, an MSI B550 MAG Mortar, was set to UEFI, while the older r9 280 GPU (from 2014) that I was using required CSM.

Since this was a fresh build migrating from Intel to AMD, I had no backup CPU for testing and I was upgrading generations on everything anyway. I purchased a super cheap Nvidea1030 GPU from Best Buy that allowed me to post since it's a brand new GPU, and from there I was able to swap over to CSM. I popped the older GPU back in and it booted up just fine.

Given that you said that the 2700x does allow you to post, I'm not sure if this is your issue, but I wanted to toss something at you for troubleshooting. In doing a quick google search (google), I did see that the 1080 ti may have issues with UEFI. I'm not sure how (if at all) a CPU would impact whether a motherboard boots in UEFI or CSM, but could it possibly be that the 2700x defaults to CSM and the 5600x defaults to UEFI? No clue if that's even possible, but something worth looking at.

 

[thai_rat]

I had a similar prob recently, does the keyboard light up with caps lock or num lock.

My problem turmed out to be faulty HDMI cable, I have 3 of them and they are all bad. The cable was working a week ago, but after rebuilding it no longer worked. So it appearedI couldnt POST, it was but I couldnt see it!