[ovirt-users] virt-viewer shows no bootoption

Hello, i will install my first vm with centos and setup vnc and spice with bootoption and centos as iso in dvd drive. i downloaded virt-viewer 3.1 for my windows10. if i start the vnc console which opened console.vv and than opened the virt-viewer i see only message of bios version and no boot medium as information. if i reboot the screen doesnt changed and i also have no option from the activated bootmenue? Can anyone help?