PC Graphics

[Relic416]

My Phantom Gaming 7900 XTX was working fine on display port until I tried connecting a 2nd monitor via HDMI. When I connected it the 1st monitor flashed on and off and gave an error message I could not read due to the flashing. Now the GPU has its default rainbow RGB and fans working, but it is not detected by the system at all and it only runs with the default motherboard APU.

I've tried restarting, resetting BIOs to defaults, re-downloading adrenaline (it does not detect 7900 XTX and tells me drivers are up to date), resetting GPU pins.

It seems a lot of these cards have issues when trying to use multiple displays but this is the first I've seen where a card is bricked from it.

[Qoojo]

I would reseat the GPU, and double check power connections. Go back to one monitor. Use DDU to remove AMD GPU software and make sure that remove present and hidden monitors is checked in options. Then reinstall amd drivers.

[Relic416 · Accepted solution]

Issue is fixed through some combination of the above, updating windows and re-enabling device on windows device manager. When I first re-enabled it told me driver failed to load, but it seems to be working.

[hrpuffnstuff]

If we're being honest connecting an extra monitor should not affect the driver or system behavior like that.  In addition to the steps already taken I'd check for corrupt system files by running sfc /scannow in command prompt as administrator.