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HP Recommended

I am totally computer illiterate. I recently purchased a HP all in one and I have been working with a HP ENVY. I would like to connect my laptop to the all in one and be able to have a secondary monitor. I purchased a HDMI cable since both of these system uses this. However, when I connected them, neither one of the recognized another device. So, I am at a lost. So any help would be useful as I really need to have two different screens. 

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