Screen turns black from time to time

Hello,

the screen turns black like every 10 seconds and there somtimes comes up some strange noise. Never heard i before. Some kind of approval sound if im correct.

Dont know any other way to describe it. I have never encountered this before. It started when a began to use a HDMI-cable connected to a dvi adapter since there was not any more than 1 hdmi-port and that one is used for my Xbox.

If you want to know more. Just ask. This is really annoying. Maybi there is some glitch with the screen/adapter,cable?

Best regards
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