KVM: Machines unbootable after host reboot

Solution 1:

The error suggests that the boot disk is not found or does not contain a valid boot sector.

• Are you writing the boot image on this disk during the OS install ?
• is the path specified in the VM file the correct disk image?

I think the problem may be the later, notice that you have:

<source file='/VirtualMachines/testFriApr11092714EDT2014_1'/>

• Is it possible that /VirtualMachines/testFriApr11092714EDT2014_1 does not represent an existing file? ..
• Does an ls -l /VirtualMachines/testFriApr11092714EDT2014_1 show that this file actually is there ?
• If the file is there, then KVM probably needs a file that ends in .img (for raw format) or .qcow2 (for qcow format).

Additional troubleshooting steps:

• attach a {CD,DVD}-ROM device (via virt-manager or virsh)
• enable boot-menu
• boot from CD/DVD when unable to boot, and actually look at the disk