With the latest versions 24.6 and 24.7, PS no longer recognizes my RTX 4070 graphics card. Up to and including version 24.5 there were no problems, after reinstalling version 24.5 the support is back.
The latest Nvidia Studio driver 536.99 is installed.
It may be an issue with the driver itself. In the past there have been issues with faulty NVIDIA drivers not responding properly. Go to Photoshop Help Menu/System Info and copy/paste details in a reply. Post only once as the system takes time to process the large amount of data.
We're not too keen on attachments here, it's better if you insert directly into the post. But you couldn't know that 😉
Do you have the beta installed? Uninstall it if you have.
Is this by any chance a laptop with dual graphics? Then you'll need to disable the conflicting integrated GPU.
Other than that, it has to be the driver. The RTX4070 is obviously fully supported and is pretty much an ideal GPU for Photoshop's current requirements.
Uninstall and reinstall the driver. Check "clean install" to remove all traces of the old driver.
Uncheck all the extra components in the driver package! You don't need them; just install the base driver.
Oh, and, did you connect both the PCIe power cables to the power supply?
This is weird. I have never heard of anything like this.
It could be corrupt Photoshop preferences. To nuke this completely for a fresh start, uninstall Photoshop and choose to not keep settings and preferences. That should remove everything. Then reinstall.
The preferences contain the entire app configuration, and corrupt preferences can cause the strangest behavior. Preferences are rewritten on every application exit, so are prone to corruption.
Migrating preferences from a previous version is always a bit risky. I never do it. They may not mean exactly the same thing in the new version.