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All in one loud 3 slow deep beeps and 4 fast high beeps

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All in one
When I turn it on it has 3 slop deep beeps then 4 high pitched fast beeps. The screen doesn't come on either.
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See: HP and Compaq Desktop PCs - BIOS Beep Codes


to match the pattern against the possibilities listed in that document.


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If you have a machine that was made in 2016 or after, then there's a chance it could be the AC adapter. If you have connected an incorrect or faulty adapter, this will result in POST beeps.


Can you let me know the model?



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