I am having a similar issue, but I dont even get the chance to select any options. It brings up the proxmox splash screen, then immediately brings up a terminal that starts loading the initial ram disk. At this point my screen goes blank. Trying to install on a Supermicro. I originally had this running fine with 7 but my upgrade from 7 to 8 killed my network settings and I could not get them sorted so decided to do a fresh install.