all-in-one will not boot.

[BSilkensen]

After update and reboot is won't boot. Three long beeps and 4 short beeps, give an error about unsupported adaptor then shuts off. I'm at a loss as what to do.

[itsmyname]

@BSilkensen -- unsupported adapter

It could be the power-adapter, but that is not likely.

It could be a problem with the video-adapter inside your All-In-One.

How good are your technical skills for trouble-shooting such hardware problems?

How old is your computer?

If only a week or two, take it back to the store that sold it to you, and exchange it.

If less than a month, telephone HP Support, to get free support.

If less than one year, exercise the HP Warranty to get HP to fix it, at their expense.

[BSilkensen]

I found a post that said to unplug it for 10 sec then plug it in again!   It worked!!  I don't understand how that did it but I am back in business!

TKS

[WAWood]

@BSilkensen 

HP describes this as a system board-related failure: processor, system board, and/or PSU.

The cheapest of these to deal with would be the PSU -- but HP used custom PSUs and it's not a simple matter of replacing it with one that is the same size as the HP PSUs often have specialized cables the retail PSUs don't have.

As to the processor,  if that is socketed, then it is replaceable -- but there is no guarantee that this will fix it and any replacement is likely to cost hundreds of dollars.

As to the system board, those are custom built for HP and neither HP sells them, nor do the suppliers.  So all you can hope for there is a USED unit and those are not guaranteed to work.

Your best bet is to take this to a PC repair place and see what they can do for you.

[itsmyname]

@BSilkensen --  unplug it for 10 sec then plug it in again!   It worked!!  I don't understand how that did it 

The motherboard probably had a "residual" amount of electrical power, due to having "capacitors" that store electrical energy. Disconnecting the power-supply (and then maybe pressing the ON/OFF button) might have "drained" that energy.  Or, simply moving the computer to access the plug "jiggled" your computer just enough to affect some intermittent connection.