Z790 Apex Encore...No Video on initial start up

[akicelander]

I am still troubleshooting, but wanted to send off to the group...I've also sent a tech support request.

Just finished a new build for a customer. So this is a new motherboard that has not been registered yet.
- z790 Apex Encore
- I9 13900K cpu
- ROG 4070 TI gpu (and evga 3090ti)
- DDR 5 trident z ram 8000mhz
- Helios Case
- ROG 1000W PSU
Upon completion and start up, no video, only rgb lighting and case fans, swapped gpu to evga, no change. reseated ram one stick at a time...no change. removed cpu and inspected and changed cmos battery. I am not about to change cpu's since I have a spare and will update but while I am reasembling, maybe the group has some other ideas.  On a side note, the Ryujin III 360 fans and rgb are not working, plugged into AIO header and cpu 1 header which I've done this way for over a decade.  This is my 3rd build with this board and really like it, but I don't ever recall not having video on initial start...so I can't get into bios either.  Also I know from experience when you remove the screen off the AIO from it's contacts, it defaults to 100% speed and when I did it with this board, nothing happened.  let me get to changing out the cpu and reassembly this thing.

Thanks everyone

[akicelander]

It should say "I am now about to change the cpu...." sorry

[Nate152]

Hello akicelander

Have you tried updating the bios to version 0801 with the bios flashback feature?

ROG MAXIMUS Z790 APEX ENCORE | Gaming motherboards｜ROG - Republic of Gamers｜ROG Global (asus.com)

[akicelander]

Not yet...got tunnel vision with "components".  I had another set of RAM sticks (7600) and it booted up.  Did all my install & updates...minus the bios, (thanks for the reminder).  I'll get the bios updated and put the 8000 sticks back in and see if it was a bios issue.  thanks again Nate!

[Nate152]

Certainly, at least we know your pc is functioning which is a good sign.

Later bios versions have better ram compatibility and performance, it would be worth updating to bios 0801.

I don't have any doubt the ROG Apex Encore can run 8000MHz memory, but you will need a very good 13900K and even then, you still may have to raise some voltages to get 8000MHz stable.

[akicelander]

Bios is updated and I had another build for a customer and they wanted to high mhz ram so threw it in there and booted right up.  Personally I just build what the customer wants and do not OC or play around in the BIOS.  I may swap out the 7600 for the 8000 one last time and see if it boots, if not I'll leave the 7600 in there.  Many thanks for the assist and educating me on something I never experienced before.

[Nate152 · Accepted solution]

You're welcome

After swapping out the memory, with your pc turned off, clear the cmos and see if she boots up.