Regarding the stuck power button... it requires diagnosis, because several things can cause the button to stick, the button itself on the panel, the rod (if there is a rod on this model), or the switch.
If it does seem to be the switch, check if you can manually pull the rod out back to the OFF position. If you can, then the switch is just sticky probably because it's old, or corroded, or dirty.
In my case I had a pushbutton switch that was too sticky to return to the off position. I soaked it in alcohol. After it dried, the switch action got worse. I then worked in some machine oil, and that fixed it.
Machine oil is probably not ideal, eventually it will probably gum up again or dry out.