I have an HP PSC. I have an HP PSC 2200 series all-in-one printer. When powering on, all 4 lights

Question

I have an HP PSC 2200 series all-in-one printer. When powering on, all 4 lights keep flashing and the message is "Remove and check cartridge." I have cleaned the cartridge connections and everything else I know of to do.Any ideas? Thanks.