I have no idea whether your absolute statement to avoid Lenovo is justified, or should be limited to specific products.

The problem I have with All-in-One computers is they have most of the disadvantages of laptops with almost none of the advantages. If that were a basic desktop computer, it would be a simple job to replace the power supply and it would take a standard power cord that many of us have dozens laying around in our basements.

As someone else stated, you did seem to run into a poor repair diagnosis and support.