Hello - I was having problems with my cursor disappearing on my Toshiba laptop so I called John Lewis helpdesk as it still under guarantee. The tech support personsaid it sounded like a software problem so wasn't covered but suggested a factory reset might solve it. I've backed up and done factory reset but now it won't reboot - it says there are no media files. Ive got it to InsydeH20 page but it's meaningless to me - any ideas?