Similarly to Deano's reply, what about an Android TV box?
I used to have a Strong(branded) Android box, for years prior to getting a smart TV.
I think it's basically an all in one unit for 'ya.
I found the box from my old Strong unit, but can't find the actual unit or power brick for it to check it's actual power requirements.
But they use basically no power(something like 8w max), so the power requirements into the box could only be something like 5v or something(maybe 12v).
Not exactly a PC, they're basically a tablet, with multiple output types, include TV output.
Depending on your actual PC/software requirements, if a tablet/smartphone is useful to you as a PC .. then could be a option.
If I could find my actual unit, you can have it(long since disconnected now).
So all you then need is an appropriate screen.
Search ebay(or your fave website) for android TV box. They're usually about $100-ish.
