Random error code problems?

When I first got my printer off of Craigslist it read Unable to Clean. I cleared that up by resetting purge to all zeroes and cleaning out the ink absorber box. While I was setting all other settings to all zeroes. I think I should have stopped at zeroing just purge. Since then I've had error 50,error 46,36,Unable to Init., and now somehow it now reading Unable to print. I think (remember I said THINK) if I could reset all the default factory settings it would start working corectly. I'd be eternally grateful if someone could help me resolve this problem. I'm trying to fix this printer for an older woman in my building !

Thanks, Ronnie

P.S. There are no paper fragments or foreign objects in this prinetr !