Screen flickering issue

dixit8611

Journeyman
Hello all,
My pc config is Gigabyte B85 D3H,i5 4440,2* 4gb Corsair C9 ddr3,Corsair VS 650,Samsung EVO ssd, Win 8.1. currently i am not using any GPU. Sometimes my pc is showing distortions and flickering as shown in the pic. Flickering is horizontal and there is KHHHHRRRRRRRRR noise. Only restart is reviving the pc. It is happening 1-2 times a day. What could be the reason ? 20150209_120400.jpg
 
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