GPU not registering

[Valiantt]

I have an HP omen obelisk with a i7-8700 and a rtx2080. I recently wanted to downgrade the gpu to a 1080. The PC boots up normally, but once the obelisk logo shows, the gpu stops spinning and when I open task manager or any benchmark application(3D Mark) nothing shows up for the gpu. Its only the intergrated graphics from the 8700. 

[Max3Aj]

@Valiantt, Welcome to HP Support Community. 

Thank you for posting your query, I will be glad to help you. 
Thanks for all the detail — sounds like a classic GPU detection issue after a hardware swap. Here’s a breakdown of what could be going wrong and how to fix it:

✅ Step-by-Step Troubleshooting:

Reseat the GPU

• Power off the PC completely.
• Unplug the power cable.
• Remove the RTX 1080, clean the PCIe slot gently with compressed air.
• Reseat the GPU firmly into the PCIe x16 slot.
• Double-check that any power cables (6-pin / 8-pin) are properly connected to the GPU.

Check BIOS Settings

• Boot into BIOS (usually by tapping F10 at startup for HP systems).
• Look for:
  • Primary Display Adapter or Graphics Configuration.
• Make sure it's set to PCIe or Discrete GPU, not iGPU / Integrated.
• Save changes and restart.

Clear CMOS

This resets BIOS settings, in case something's stuck.

• Either:
  • Unplug the PC and remove the CMOS battery for ~5 minutes, then reinsert.
  • Or use the CMOS reset jumper (check motherboard manual).

Boot into Safe Mode & Use DDU (Display Driver Uninstaller)

• Boot Windows in Safe Mode.
• Use DDU to clean uninstall NVIDIA drivers.
• Power down, reinstall the GTX 1080, and then power up.
• Reinstall the latest NVIDIA drivers for the 1080 from NVIDIA’s site.

Check Device Manager

If the GPU is still not detected:

• Open Device Manager > Display Adapters.
• See if it shows "Microsoft Basic Display Adapter" or

I hope this helps. 

Take care and have a good day. 

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping! 

Max3Aj

HP Support