Windows 11 Upgrade Guide
Where can I buy a power supply for my HP Pro 3420 All-in-One?
@AlePietro -- one place to look is HP's web-site: http://PartSurfer.HP.com
Do a search on your HP's model-number, and you should get a list of all the HP parts for your model.
Of course, if you see "N/A", then the HP warehouse does not have any replacement power-supply.
If that happens, try searching on eBay and Amazon.
Or, support a local owner/operator computer-store business, to see if they have anything that is compatible.
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