Question No VGA signal on POST with brand new RTX 4080 S

[Yurikane]

Hello everyone,
I'm a bit desesperate so i try to find new angle to solve my issue.
I recently bought a 4080 Super FE but it never pass VGA post.

My system :
CPU : 5800x3D
MB : B450 tomahawk max
Ram : 32Go RAM 3200
PSU : Corsair TX750M
GPU : 4080S previous one > 6950XT so about the same power usage

What i have tried so far :
- Bios : update to the most recent one / Switch between UEFI to UEFI+Legacy / Force Pcie3
- Clear Cmos
- Reseating cables multiple time / Try different one in different slot from PSU
- Connect with HDMI / DP on 3 differents screens
- Clear in safe mode previous drivers multiple times with DDU and AMD clean up utilities

Whatever i have done, i never had access to Bios or windows with the new card. I can boot with no issue with a really old one : ATI HD 4870
When i power on with the RTX, both of its fans are working correctly , the LED Geforce RTX are white so nothing particular but it had never pass a single time VGA post. I can't test right now the GPU on other setup, i will try tommorow.

If you have any suggestion, you are welcome and thanx you by advance for your time. I'm sorry for my terrible english.

 

[Lutfij]

Welcome to the forums, newcomer!

PSU : Corsair TX750M
How old is the PSU in your build? Try and source a reliably built, higher wattage PSU and see if the issue persists.

Bios : update to the most recent one / Switch between UEFI to UEFI+Legacy / Force Pcie3
What BIOS version are you on for your motherboard?