Well it isn't a problem if the bootmgr screen comes up. If it appears because of a problem, it would say that. For example, if it was for an improper shutdown, it would say something to that effect. Does this screen show up every time you turn on the notebook? As far as the keyboard not working at that point, it is entirely possible that the keyboard device is not enumerated at that point. Or if it is on the USB bus, the USB might not fully work at that point, but its hard to say that for sure. Does the keyboard work after going into Windows? How about the BIOS can you get to there? You may find advanced topics to change the default timeout to something shorter than the 25 seconds you're waiting at the bootmgr screen.