If this is a Windows 8 upgrade, it's a common problem. First you have to ID the Unknown device in Device Manager with a yellow triange. Take a look at this forum: http://h30434.www3.hp.com/t5/Notebook-Operating-Systems-and-Software/acpi-ven-hpq-amp-dev-0004/td-p/2537553 You can try this software:
Click on this link or copy and paste the complete link into your browser.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response
Thanks, Joe
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309
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