Imac blank white screen

  [email protected] 09:38 29 Mar 2015

My IMac 27" shows five vertical stripes on a white background when I turn it on, while also showing the progress bar for starting up. After that the screen turns completely white and only shows the mouse arrow. It stays that way. The IMac is app 5 years old and uses the latest IOS. Any good ideas? Thanks a lot, Jacob

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