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HP Recommended
HP all-in-one PC

When I try to turn on my computer, it gives 3 hard beeps  and 4 fast beeps and will not load up

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HP Recommended

I *think* the mainboard is telling you it has a power failure.

Verify that the AC adapter you're using is the CORRECT wattage for your All-in-One.

Newer HP All-in-One's will give you POST beeps if the AC adapter has a lower wattage than it's expecting.

If you can reply with the exact model you have I'll tell you the wattage PSU you should be using.

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HP Recommended

Greetings Diva21,

Welcome to the forum.

I am not a HP employee.


BIOS eror codes for HP PCs can be reviewed at this site (Link).


A 3:4 BIOS error code means you have a hardware problem if your PC was made in 2015 or later.


Possible hardware issues:


Power supply


System board


Contact HP (Link) if in warranty. Find a good, local, PC tech if you are not in warranty.



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