[SOLVED] 3500x not posting with Asus Crosshair VII mobo

[mcqualityb]

Hi,

I am putting together a PC build using a mix of old and new parts for a friend and the system won't post.

CPU: Ryzen 3500x (new)
MOBO: Asus Crosshair VII Hero Wifi (Used)
GPU: Nvidia Gefore GTX 1080 (used)
RAM: Crucial 2133mhz DDR4 (4 16gb sticks/used)
PSU: EVGA 600 BR 80+ Bronze (new)

I flashed the bios to the most recent version using the flashback tool since we didnt have a supported CPU to use. It looked like the bios should have flashed correctly, but when I power up the system it won't post. I am getting a 0d code and the CPU debug led is on. All of the fans including the CPU fan are running. The only thing I can think of is maybe the PSU is not supplying enough power for the CPU. The PSU does not have the extra 4 pin connector for the CPU power on the MOBO.

Any suggestions would be greatly appreciated.

 

[mdd1963]

Any PSU made in the last 12-15 years should have an ATX12V CPU PWR connector, if not two of them... (possibly, you have the 8 pin, but not the 4 pin? If so, that should be ok)

It certainly is not going to work with no CPU PWR connected....

If a modular PSU cable, find the correct cable, string it from the PSU to the top of the mainboard, and connect it.

 

[NightHawkRMX]

Any PSU made in the last 12-15 years should have an ATX12V CPU PWR connector, if not two of them...

It certainly is not going to work with no CPU PWR connected....

If a modular PSU cable, find the correct cable, string it from the PSU to the top of the mainboard, and connect it.

I think the op means it doesn't have the extra 4 pin in addition to the 8 pin required on some boards

This shouldn't be an issue.

 

[mcqualityb]

I think the op means it doesn't have the extra 4 pin in addition to the 8 pin required on some boards

This shouldn't be an issue.

The PSU is not modular and only has the 8 pin power connector for the CPU.

I tried reseating the CPU and took out all but 1 stick of RAM. I rebooted and got the same 0d code with the CPU debug light on but it switched to an 8 code with the CPU light. The 8 code according to the manual is insufficient CPU power.

The previous set up I used with this mobo used an evga supernova g3 550W PSU that had the 8 pin plus the extra 4 pin with a ROG strix 1070ti and a ryzen 7 2700x. I am going to try swapping out a PSU with the extra 4 pin and see if that works

 

[popatim]

0d... Asus's mystery code...
One guys swears the fix is to hit he Clear Cmos button and then immediately hold the start button down until you see qcodes.
others typically warranty the motherboard. I don't have asus boards fwiw.