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I used an HMDI cable between my laptop and all in one HP computer, which worked beautifully, but now, once I have disconnected my laptop I can’t turn my computer on at all. There is power going to the machine.

i only have the on/off button on the left hand side and 3 buttons on the right hand side?

please can someone give some advice as I need to get the information and files on my PC.

Thank you 

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