Blank blue screen

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Sammy50 Posts 2 Registration date Wednesday March 23, 2016 Status Member Last seen March 26, 2016 - Mar 23, 2016 at 11:14 PM
I was upgrading my pc to window 10,but before the process was completed there comes a data back up screen,i pressed "ok" since then my pc has been on blank screen pls what should I do?but there's a click sound every few minutes and the fan is not running.Thank you