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Start up 3 long beeps 3 short beeps

HP Recommended
envy 860-180st
Microsoft Windows 10 (64-bit)

After connecting Dell u2720q 4k monitor I get beeps on startup. 3 long beeps followed by 3 short higher pitched beeps, the series repeats 5 times. Window 10 64 bit, nvidia geforce 960. I have tried multiple display port cables.


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