It says there is a paper jam. There is no paper jam.
My HP Color LaserJet 477fdw tells me there's a paper jam. I've done everything I can think of — opened the back door to look for shreds that might be occluding a sensor; spraying the roller with compressed air; unpluggings/repluggings; examining the duplexing mechanism... So I can't print, or scan, or copy, or—
I'm at wit's end. Grateful for anyone who might suggest next steps, other than an angry trip to the recycling center.
Thanks in advance.