When you turn the printer on as it starts up do you hear the gears move as if it were about to load paper if so turn the printer off and manually roll the bar that feeds the paper through back about half a turn. When you turn the printer on if this bar moves and covers that half turn then I personally would think the gears or some thing is out of sync and would try fiddling with it that way. But it the printers firmware is unresponsive I would locate the chipboard and hope there is a cmos battery and remove it to try and reset the firmware, although with printers this is rarely the case and when you get errors the printer won't let you do much with it's settings and sometimes only be fit to unplug it just to get it to turn off until the error is fixed