I added a GPU and since then I lost VNC connectivity, So how do I access the vm from another pc on same network.  The VM starts with no errors, but I need to access the desktop

Temporarily switch back to VNC as your video adapter so you can access the VM OS. Install remote access software such as nomachine, or enable RDP. Make sure you can use that access method while VNC through Unraid is still available to troubleshoot. Once you successfully can access it using a different method, then switch back to your GPU.