I have cleaned as much as I can and done a print test which works fine, but as soon as the printer is idle, it starts this repeated printing of DeviceCapabilities?DeviceStatus? over and over as mentioned before, even when the computer is shut down. It does a line of A4 once every twenty seconds or so. Is there a way of resetting the factory settings on the printer itself?
The printer printed from the notepad application clearly but then afterwards went back to printing the Device lines as usual, with no instruction. I have taken the cartridges out as you said and cleaned the print head but it still goes back to doing its own thing. This does not appear to be an ink cartridge problem.
Thanks for trying.