Hi, I have been banging my head for last 3 hours trying to install Proxmox using the ISO 5.4-1 on Fujitsu Primergy RX200 S7 - every time I ended up on screen saying no cdrom found. I tried Ether, rufus, Easy2Boot - nothing has worked. Then I have stumbled onto this page: http://rmprepusb.blogspot.com/2014/03/add-proxmox-isos-to-easy2boot.html - last line is saying "Note: proxmox 5.4 seems to be broken. It won't even boot if I dd the ISO to a USB drive." So I went ahead, downloaded Proxmox 5.3 ISO and indeed everything is working fine. So there is definitely something wrong with 5.4 installer. I hope this topic will save someone some time and maybe it will get fixed.