If it is desktop and a pc. The laptop finally started up but when i logged into my user account (which was admin), i found most of the icons on window 8 page has disappeared and all the programmes are gone. I have my laptop connected to an external monitor and always had it set for dual display.
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Recently it has changed to computer monitor only and won't let me choose any other setting. If it is laptop then i would suggest you to contact manufacturer support website for software and drivers for the special function key on the laptop keyboard.