Chosen Solution
Evening from Australia everyone, My friend approached me earlier today and said his high-end pc won’t output to a monitor via DP. I tried to help him over the phone but he asked i pick it up tomorrow so i thought i would get some advice before i start troubleshooting. Here’s what i know so far: 12900k 3090 pcie 3.0 riser (Says he’s gone to bios and set link speed to 3) Apparently only works on HDMI Apparently has bad drivers (I am unsure though) anyone who has any thoughts/help would be strongly appreciated as he just build this only to have it not run his games. I will update this thread once i get the pc and more info
When you receive his PC, please try the following: Firmly re-seat the PCIe riser card in its slot and reset BIOS to its default settings. Confirm that BIOS recognizes the card without errors. If BIOS displays a problem, try another slot. Try a BIOS update, as well.Launch Device Manager, uninstall the display/monitor drivers, and reboot the computer. Windows will detect the monitor and install the drivers it recommends.Try the device troubleshooting utility. Open command prompt as an administrator, copy/paste the following, and hit Enter: %systemroot%\system32\msdt.exe -id DeviceDiagnostic Follow the prompts to allow Windows to look for the problem. If none of these work, then manually isolate the problem component. Try a different monitor/cable, computer, monitor DP port, PCIe card, PCIe slot, and drivers. Confirm that the problem returns before moving to the next component.
You might also want to go to a command prompt and run CHKDSK C: You can also try booting to a Linux USB disk and running some things just to verify the problem is with Windows and not a hardware issue.
