Question (New Build) VGA light and Boot light show with no display - Asus TUF B550 WiFi II

[Ken6d0]

Hi all, doing a new build for a friend but the system does not output any display.

The board cycles through the troubleshooting lights and the fans, GPU and keyboard etc turn on but no display signal is emitted. The VGA (white) and Boot (green) lights stay on and nothing else happens.

Build specs:
AMD R5 5600 CPU
Asus TUF B550-Plus WiFi II
Klev 3600mhz ram 2x 8GB
Rm750e PSU
PNY RTX 3070

Steps tried which result in same error:
-removing board from case and clearing CMOS
-Updating Bios to latest using USB flashback
-Using a different single 16gb 3600mhz stick from main rig (Gskill Trident) in different slots.
-Installing 3080 ti from main rig

-Swapping CPU and using 5950x from my main rig
-Using old HD 7970 (when using this card the system keeps boot looping, still no display to know what's going on)

-Removed NVME drive installed on board
-Tried a different PSU (GS800 - known to be working)
-Tried 2 different monitors switching between DVI and HDMI (monitors don't even show no signal message)

-I have now purchased a new board, same spec Tuf B550 WiFi II and guess what... STILL THE SAME PROBLEM. Even after flashing the new bios once more.

All these things I tried resulted in the same issue. I am guessing the problem is some sort of compatibility issue on the motherboard side of things relating to the GPUs. The HD 7970 might be faulty based on the fact it made the pc reboot infinately.

If one of you amazing experts could give me a hand with this I will be eternally grateful. Thank you so much in advance!

 

[drea.drechsler]

Not mentioned was CMOS reset with pulling out the battery along with shorting the reset pins for a couple of minutes.

Also, bring it up on one DIMM at a time using the 2nd DIMM slot away from the CPU first.

Constant re-booting can be a failure to train memory, something a CMOS reset w/battery pull often fixes.

Have you tried the 2nd PCIe X 16/4 slot? Obviously it will be sub-optimal for actually use with a gaming GPU but it will help determine if there's a problem with the primary slot.

 

[rocktalkrock]

Have you tried a different HDMI cable?

 

[Ken6d0]

Not mentioned was CMOS reset with pulling out the battery along with shorting the reset pins for a couple of minutes.

Also, bring it up on one DIMM at a time using the 2nd DIMM slot away from the CPU first.

Constant re-booting can be a failure to train memory, something a CMOS reset w/battery pull often fixes.

Have you tried the 2nd PCIe X 16/4 slot? Obviously it will be sub-optimal for actually use with a gaming GPU but it will help determine if there's a problem with the primary slot.

Tried the second slot with the 3080 ti and 3070. Once with cables plugged in and unplugged each to try and trigger CSM mode as I read some Nvidia cards have trouble with Uefi on boards with this chipset. It's driving me insane lol. CPU isn't faulty as it works in a Dark Hero crosshair 3 mobo. 2 new boards with the same issue is strange. Cmos was reset by pulling battery and waiting, it did a double post cycle so I imagine it cleared ok.

 

[Ken6d0]

Have you tried a different HDMI cable?

Tried HDMI and DP from 2 different monitors, no change unfortunately.

 

[rocktalkrock]

Tried HDMI and DP from 2 different monitors, no change unfortunately.

Are you certain the RAM sticks are pushed down all the way in their slots, at both ends?

 

[Ken6d0]

Managed to fix the problem by doing these in this order:

Reset CMOS
Flashed latest bios using flashback button
Reset CMOS again
Finally got the VGA light to disappear and got a signal through HDMI on the 3070. Hopefully it helps someone else with the same issue.

Seems to be an issue with this type of board although it claims to support Ryzen 5000 out of the box. I flashed the same bios before but maybe the double CMOS clearing fixed whatever the issue was.