I recently restored a disk image made from an HP Envy 17t-K200 to an HP Envy 17 K250CA notebook, which has an identical motherboard. There are now two operating systems on the K250CA. One of them, a fresh Windows 7 Professional SP-1 install, works fine. The other -- the restored disc image -- boots a black screen, without the Windows logo. If I use the Windows installation media to repair startup, it reports that the O.S. booted successfully. There is no hardware issue, because the other O.S. performs normally. I'd appreciate suggestions on getting the restored O.S. to work. I understand there are some driver issues, but I don't see how that would stop the Windows logo from appearing.