Black screen

[Rosita123]

Pc turns on but screen remains black

[itsmyname]

Possible problems:

1. failing external power-supply;
2. broken connector where the power-supply plugs-in to the computer;
3. motherboard failure;
4. disk-drive failure.

It's time to take the computer to a qualified computer technician for trouble-shooting & repair, which might be expensive, or to buy a new computer that will be compatible with Windows 11 (announced last week). It might be a week or two before any computer that you purchase today will be branded as "ready for Windows 11".

[WAWood]

@Rosita123 

Your are free to buy what you want -- but seeing as how Windows 11 is not going to be formally released for four MONTHS yet, it is a bit premature to go shopping for such a PC at this point.  MS has not even finalized the hardware requirements for Windows 11 at this point, so it's unlikely that OEMs already have PCs sitting on the shelf ready for sale.

The real issue with ALl-in-Ones is that they are basically huge laptops with external keyboards and mice -- and they suffer from the same limitation as laptops -- no expandability and very difficult to service. You can't just take off the side of the case and look inside like you could with a real desktop PC.

To determine the cause with hardware failures, you have to be able run diagnostics. We have no way of accessing your PC from here, so we can not do that for you. You have to do it yourself.

You do this by pressing the Esc key repeatedly when rebooting and then, when the HP Startup Menu appears, selecting Diagnostics (usually F2) and letting it run.

If it is NOT possible to run diagnostics, or if that does not work, then there is NOTHING more you can do by yourself -- and there is NOTHING we can do.  You will then have to do as suggested and take it to a service facility to have it examined.