I just installed Fedora Core 6 on a ESXi 5.1 host.The install went fine and I selected the Lsi Logic Parallels SCSI adapter when I built the VM originally. Once the install completed, I converted it to a template then deployed a VM from it.
When the VM powers on, it states OS not Found and I do not have a NIC attached and already checked the VM's BIOS boot order
Do you have that setting set?
which would explain the loss of the OS on shutdown..