Question New Build with an ASRock Z790 Pro RS WiFi won't POST ?

[jwalker93]

I just put together a new PC with the following:
Z790 Pro RS WiFi (Bios v6.04)
i5-12600k w/ Deepcool AK620
G.Skill Trident Z5 32GB (2x16) (F5-6000J3636F16GX2-TZ5K)
Seasonic Focus GX-750
No GPU installed yet
Windows 11 Pro 64 bit

Before I installed Windows, I had ram in A2+B2, but it wouldn't post. Ended up using 1 stick to install windows. I think in A2. Tried different combo's after installing windows and it started working in A2+B2 w/ XMP.

Last night I unplugged the PSU and took the back panel off to zip tie some wires. Didn't touch anything on the mobo. Plugged it back in and it wouldn't post. Tried the following:
RAM 1 & 2 in A2+B2 - no post
RAM 1 in A2 - post
RAM 1 in B2 - no post
RAM 2 in A2 - post
RAM 2 in B2 - no post
RAM 2 in B1 - post
RAM 2 in A1 - post
RAM 1 in A1 - post
RAM 1 & 2 in A1+B1 - "System failed to boot several times" then post

The RAM sticks both work. I don't have another CPU to try. I checked the pins and none were bent. I reinstalled the AK620 in case I overtightened and it didn't change anything. Bad memory controller on CPU maybe?

If anyone has any ideas or suggestions, I'd really appreciate it. Thanks!

 

[helpstar]

reset the BIOS by jumper
use A2+B2

update BIOS to 6.02, I guess 6.04 was a typo?

sometime the BIOS needs time to post the 1st time after power out or reconfiguration of RAM, wait for about 2 minutes before touching it again

 

[jwalker93]

reset the BIOS by jumper
use A2+B2

update BIOS to 6.02, I guess 6.04 was a typo?

sometime the BIOS needs time to post the 1st time after power out or reconfiguration of RAM, wait for about 2 minutes before touching it again

Sorry, yeah that was a typo. Bios is 6.02. Reset Bios and tried again. Nothing. Left it for about 15 minutes.

I found this video last night and it seems to be the same issue. I'm going to send the CPU back and get a replacement. See if that works.