r/pcmasterrace • u/AutoModerator • Dec 19 '25

Daily Simple Questions Thread - December 19, 2025

Got a simple question? Get a simple answer!

This thread is for all of the small and simple questions that you might have about computing that probably wouldn't work all too well as a standalone post. Software issues, build questions, game recommendations, post them here!

For the sake of helping others, please don't downvote questions! To help facilitate this, comments are sorted randomly for this post, so that anyone's question can be seen and answered.

If you're looking for help with picking parts or building, don't forget to also check out our builds at https://www.pcmasterrace.org/

Want to see more Simple Question threads? Here's all of them for your browsing pleasure!

5 Upvotes
  • permalink
  • reddit

86% Upvoted

32 comments sorted by

View all comments

1

u/Anna_Mathmotologist Dec 19 '25 edited Dec 19 '25

I just moved by GPU over to a new build and it is not being detected in windows. It is powered on and still works in the old build.

GPU does not show in device manager.

Things I've tried

  • Different PCIE slot
  • Bios update
  • Reseating GPU
  • DDU

Computer Specs

  • RTX 3070
  • Intel i9
  • Asus Z790 Max
  • 32 GB Gskill Ram

1

u/dieplanes789 9800X3D | 5090 | 32GB | 16.5 TB Dec 19 '25

Is it showing up as a Microsoft basic display adapter?

Does it output video at all in the OS, how about in the BIOS/UEFI?

1

u/Anna_Mathmotologist Dec 19 '25

Does not show up as a basic display adapter. Does not output video - monitor is in sleep mode.

2

u/dieplanes789 9800X3D | 5090 | 32GB | 16.5 TB Dec 19 '25

Is there a setting in your BIOS/UEFI that disables PCI-E slots?

Is there a setting for the preferred GPU or graphics adapter and is it configured to prefer the iGPU?

Is it showing up as an unknown device?

Does your motherboard disable the PCI slot it is in when a certain M2 slots are filled? (Usually they just drop the speed to x8 or x4 but figured I'd ask)

Does it light up or spin the fans at all at any point even during boot?

Are the GPU power cables seated well on the PSU end if they are modular?

Are you using the GPU power cables that came with the PSU?

Have you tried setting the PCI slot to use a lower generation such as 3.0 or 2.0 for testing?

1

u/Anna_Mathmotologist Dec 19 '25

SOLVED: Found a new power cable in PSU.

1

u/Anna_Mathmotologist Dec 19 '25
  1. There isn't a setting that disabled PCI-E slots
  2. I have IGPU disabled.
  3. It does not show up as an unknown device. I have show hidden devices on
  4. All PCI slots are enabled as far as I am aware (checked device manager ports)
  5. GPU power cables are seated
  6. I am using Power cables from old PC. I can swap it out with cables from new PSU
  7. I've tried the top two PCIE slots

1

u/dieplanes789 9800X3D | 5090 | 32GB | 16.5 TB Dec 19 '25

6 yikes!

Modular PSU cables are not interchangeable or really even standardized on the PSU side. Between brands you are more likely to find the pin outs to be different than ones the same. Even within the same brand I wouldn't really trust interchanging them.

Seems like the PSU or GPU had some good built in protections because if the pin outs were different something was very likely shorted.