Those errors typically pertain to a driver problem with the IDE controller. If the boot device [hard drive] is inaccessable, then obviously something in between the OS and the hard drive is ...

Some users have complained about this problem that when they start their computer, it doesn’t boot. Instead, a Default Boot Device Missing or Boot Failed blue ...

it wont.<P>the repair disk wont even be able to find the windows install TO repair, because its an inaccessible device<P>because it _doesnt know_ how to talk to the motherboards hard drive controllers ...