Hi Jim ... I have a Lexmark Z55 as well and yesterday it stopped working and is flashing the same "code" as you mention ... five times left then twice on the right and I can't get the thing to work at all (rebooting, etc.). Also I open the panel to get to the ink and the cartridges do not slide out to the middle like they normally would and there is some red light (sensor) that is stuck on and won't shut off. My power went out yesterday and I have a feeling this is the cause of the problem (it was attached to a cheap surge protector). I haven't found out the problem yet, but if I do I'll try to report back here - let me know if you figure it out.
Jay