No display after POST

[Luger]

Hi all (again). So I have this "weird" issue where my VG328 (I believe) from ASUS' VG1B series gaming monitors does not give me any display (no BIOS splash screen, no Windows screen) even though I can literally hear the Windows start-up sound from my headset. It's a 31.5", curved,1080p @ 165Hz monitor with HDMI/VGA input only, so I'm using my RTX 5080's only HDMI port. What kind of problem is this? Before the new Nvidia Driver update came out like a day ago (which I clean-installed), I was able to get a display, but even then, it wasn't the smoothest operation: when I started the PC, my monitor would turn on, show me "No HDMI input", put itself back into standby mode and would not wake up unless I press any button on the monitor itself. The most frustrating part of all this is that I get no splash screen when using dedicated GPU, and if I try to spam the BIOS key, my monitor won't even detect any signal/display, no matter how many times I restart it. So as of today, after the update, I can't even get a display for Windows, not to mention the BIOS/UEFI.

 

When I plugged in my older system (with an RTX 3060Ti, I got a display with no problems at all). ChatGPT suggests it's some kind of a "handshake/firmware incompatibility"? When I took it to a PC service shop, the tech guy was able to instantly boot into BIOS. Should I be looking into new monitors? But even then, why does my monitor work with my older system?

 

Current specs:

Ryzen 7 9800X3D

X870E AORUS ELITE WIFI7 rev 1.1. with the latest BIOS version F8a

Kingston Fury 2x16GB DDR5 RAM

X1 1TB MP700 Pro Gen5 SSD

Gigabyte RTX 5080 Gaming OC

Corsair RM850x (2024, 3.1/5.1 compatible)

Monitor: VG328 (I think) from ASUS VG1B series, 1080p@165Hz (HDMI input only)

OS: Windows 11 24H2

[Smalahovet]

Seems like your BIOS is trying to give you DP output. And failing to understand you have HDMI. 

Maybe some DP dummy plugs would help, so the BIOS understand there is no output to the DP ports. 

Trying an HDMI to DP adapter is also probably an option, but be sure to pick a proper one. The cheapest Chinese ones can give you even more problems.
But as long as its from a decent brand with proper markings etc. It should be fine. Just do not pick up a no name one from aliexpress. Cause you might even get worse trouble then. 

[Thomas53]

It appears to be a driver issue, revert to you previous version to see if the situation continues.

[OddOod]

Two potential culprits I can see:
Could be a driver issue, maybe just need to DDU and install an older driver.
Could be a bad cable? 

[FilipposTechGR]

8 hours ago, Luger said:

Hi all (again). So I have this "weird" issue where my VG328 (I believe) from ASUS' VG1B series gaming monitors does not give me any display (no BIOS splash screen, no Windows screen) even though I can literally hear the Windows start-up sound from my headset. It's a 31.5", curved,1080p @ 165Hz monitor with HDMI/VGA input only, so I'm using my RTX 5080's only HDMI port. What kind of problem is this? Before the new Nvidia Driver update came out like a day ago (which I clean-installed), I was able to get a display, but even then, it wasn't the smoothest operation: when I started the PC, my monitor would turn on, show me "No HDMI input", put itself back into standby mode and would not wake up unless I press any button on the monitor itself. The most frustrating part of all this is that I get no splash screen when using dedicated GPU, and if I try to spam the BIOS key, my monitor won't even detect any signal/display, no matter how many times I restart it. So as of today, after the update, I can't even get a display for Windows, not to mention the BIOS/UEFI.

 

When I plugged in my older system (with an RTX 3060Ti, I got a display with no problems at all). ChatGPT suggests it's some kind of a "handshake/firmware incompatibility"? When I took it to a PC service shop, the tech guy was able to instantly boot into BIOS. Should I be looking into new monitors? But even then, why does my monitor work with my older system?

 

Current specs:

Ryzen 7 9800X3D

X870E AORUS ELITE WIFI7 rev 1.1. with the latest BIOS version F8a

Kingston Fury 2x16GB DDR5 RAM

X1 1TB MP700 Pro Gen5 SSD

Gigabyte RTX 5080 Gaming OC

Corsair RM850x (2024, 3.1/5.1 compatible)

Monitor: VG328 (I think) from ASUS VG1B series, 1080p@165Hz (HDMI input only)

OS: Windows 11 24H2

That’s not a dead monitor, it’s an HDMI handshake/firmware issue with the RTX 5080.
Fixes that usually solve it:
Lock the monitor to 60 Hz before reboot BIOS/UEFI only outputs 60 Hz, if the panel waits at 165 Hz it misses the signal.
Use a certified HDMI 2.1 cable, cheap ones often fail during the UEFI handshake.
In BIOS, toggle CSM on/off, many ASUS VG panels don’t like pure UEFI GOP output.
Check ASUS support for a firmware update for the VG328, they’ve released silent fixes for this exact behavior.
If you try DP even with an active adapter you’ll see BIOS instantly. So no need to replace the monitor, it’s a timing quirk, not hardware failure.

[Luger]

Thank you everyone.

In the end, the problem was indeed a monitor handshake/firmware incompatibility, and a DP to HDMI 4k adapter quickly solved my headaches. Everything works (almost fine), as the adapter reduced my monitor Hz from 165 down to 120. But I guess, something is better than nothing, eh.

 

[FilipposTechGR]

14 minutes ago, Luger said:

Thank you everyone.

In the end, the problem was indeed a monitor handshake/firmware incompatibility, and a DP to HDMI 4k adapter quickly solved my headaches. Everything works (almost fine), as the adapter reduced my monitor Hz from 165 down to 120. But I guess, something is better than nothing, eh.

 

Glad you got it sorted . The Hz drop from 165 → 120 is basically a limitation of the DP→HDMI adapter bandwidth, not your GPU or monitor.
If you want to squeeze the most out of the VG328:
Look for an active DP 1.4 → HDMI 2.0/2.1 adapter some cheaper ones cap at 120 Hz.
Check if ASUS support has a firmware patch for the VG328 panels, they’ve silently fixed handshake quirks before.
As a workaround, you can also set the monitor to 60 Hz before rebooting into BIOS, then switch back up once in Windows. That avoids missing the UEFI handshake.
So yeah, nothing dead with your monitor, it’s all handshake + bandwidth quirks. With the right adapter or firmware update, you should be able to get back 165 Hz and keep BIOS working fine.