Can she start it in Safe Mode? I saw John suggested that above--and you said you've tried everything, but you didn't describe this. Usually as soon as the screen begins to flicker messages you'll see a brief blurb about Safe Mode and pressing F-12 or one of the others, depending on your manufacturer. Did Safe mode come up? And what does it look like? Any help there to run diagnostics? Can she go back to a date when it was working?

SRS