I am getting that error on my R740XD as well. seems like the proxmox is using a to high or strange resolution perhaps?Having some issues with the screen not working during installation on Dell R610 server. I've tried this with 4 different monitors at our data center, but was successful with Dell R630. It appears that the screen dimensions during installation (after the initial Proxmox installation choice screen, and then the windowed CLI screen that shows after it) blanks during installation, with the monitor stating that the screen dimensions are not compatible with the monitor. The monitors are typical 19" and 24" 4:3 and 16:9 ratio. I realize this may be something to do with the older servers, but what can be done to allow this installation to be completed?
P.S. Was able to install PVE 6 on that box just fine. Definitely something different in PVE 7.
It worked well with Proxmox 7.1