ive been tasked with converting it from a physical machine for an old server, now running on Hyper-V... everything looked fine until i powered it on:

Reboot and Select proper Boot device
or Insert Boot Media in selected Boot device and press a key
No bootable device -- insert boot disk and press any key
the virtual disk is attached and the right size, the original machine booted fine yesterday, where did my OS go?
i can see teh disk in teh VM settings, sooo its definately attached... the oirginal server is still around, powered off, sooo i can check settings there if nedeed... what usually goes wrong when moving an OS like this?
