Any error codes, text, or anything cryptic looking in the error message?
Google the model number. Could be some unique problem applicable to that model.
Unfortunately could well be that the xbox has reached its EOL (End-of-life). That is designed into many products these days and does not take much to cause some premature EOL.
Try a few more resets if you have not done so alreay. Hold the buttons longer, use some procedure that is "different" - try whatever reset options you can find.
If there is nothing to lose try a few gentle taps on the side....
Then, you still have the option, to open up the xbox (unplugged of course) to see what you might find. Maybe get a techie friend or family member to help. Many videos and guides...