I've converted a Solaris 10 VM and a Windows Server 2003 VM, both 32-bit from VMWare Server 2 using qemu-img convert. However, when I try to boot either of them in virt-manager I get 'A valid boot sector was not found'. Trying to boot them from the command line using qemu-system-x86_64 <path to VMDK> I just get a black window on the Windows VM. The Solaris VM started the same way starts booting fine then outputs what's in the attached screenshot (I don't even know how I'd describe it) and stops.

I'm using KVm on SLES 11 SP1. Has anyone else seeen anything like this?

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See this page maybe. http://blog.bodhizazen.net/linux/con...irtualbox-vdi/

I've found that page already, which is why I've been converting them to single file VMDKs before using qemu-img. How can I find the specific cause of the error message?

Maybe I'd dd the disk image to a file. Be sure to dd the disk and not the partition. That file would be a qemu raw file. Try to boot it. It should boot. Then try to convert it to a cqow2 format.