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My 24 inch hP all in one just has a blank black screen and nothing loads.
@Briorme -- is your All-In-One less than one year old? If so, contact HP to exercise the HP Warranty, to get it fixed/replaced at no cost to you.
Otherwise, there are several possible failure-points.
A qualified computer-technician should be hired to trouble-shoot, and hopefully repair, your computer.
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