I've been running my xbox through this PC for months now and I havent had any problems, although I do need to bring up HP My Display in order for the hdmi to work correctly. I tried to connect my xbox one to the computer as usual last night but this time it said 'no signal'. I have checked to see if other hdmi cables would work (they do not) and I have tried the hdmi cable usually used for the PC on the TV and my xbox connects fine.
I don't know of any recent update that may have caused something to go wrong, I can't get it to work.
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I came across your post about connecting your Xbox to your HP ENVY TouchSmart All-in-One Desktop PC via HDMI and having no luck with the connection. I have looked into this problem for you and have found a helpful guide for you to see.
HP TouchSmart 520 Series Desktop PC - Using an HDMI Game Console or HDMI Video Player with your TouchSmart PC - Click here
If the issue persists, I would suggest you manually install the latest drivers, using this link.
I hope this helps, let me know how it goes for further assistance.
Keep me posted,
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give us some reinforcement by clicking the solution and kudos buttons,
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Nothing suggested worked, I ended up sending it in for repair and they only made things worse. They uninstalled windows 10 and reinstalled windows 8.1 for some ludicrous reason and they also completely wiped my pc. And the HDMI still does not work.