If you have vCD in your environment here is the steps or process to boot the VM server to ISO
Steps:
Press "All ACTIONS" button on the machine and select "Insert Media"
In the properties of the machine in the "General" section, enable the "Enter BIOS Setup” by moving to the right side.
The next time you turn on the machine, it will boot into the BIOS, where you should choose to boot from CD
Once started, the system will boot from the ISO image
Note: Rollback to original settings after your changes was done.