If you use a P2V product you might have problems with many vendors' hardware monitoring software/agents such as...
HP Insight Manager/IBM Director and Dell Open Manage. Typically, symptoms might be BSOD (but not the inaccessible boot device error) or errors when the “monitor” loads. The monitor is VMware’s term for the virtual BIOS which is loaded from the nvram file. These monitor errors read along these lines:
“***VMWare ESX Server internal monitor error *** NOT IMPLEMENTED at 2263 (16390)…”
The only solution to these problems currently appears to be to uninstall this software from the physical server before beginning the P2V process.