VM booting issue, no bootable devices

sles12 sp5 virt machine shows no boot device, seems to be trying to boot from the dvd saying boot failed trying to read from cdrom. Not sure where or what to check in the boot sequence. If I mount the install iso, I can then boot the hard disk. Any ideas or what to check and or run to repair?
Thanks in advance!

I saw the same when I installed virtual machines within openstack. Can you switch the boot order on the hypervisor?