I have searched Google and all over for solutions to getting the color to print on my X73 printer using a new Lexmark 20 color cartridge but no one seems to know. This is a new cartridge so the ink flows -- I double checked with a cleaning wipe. The black 70 cartridge works just fine. I upgraded the driver from Lexmark this week but saw no changes in software appearance or printing. The control program version is Lexmark 18.104.22.168 (non-LCS), I have Windows XP Home (you do get the unsigned driver warning when installing the printer). I've had this printer for 4-5 years -- at one time the color not printing was due to the drying-up and clogging, so I bought a refillable one with 3 injections for color. That worked for some time until that clogged up too. I can understand clogging/drying problems if the cartridge sat aorund for months unused -- but the one I bought recently is new $32 from Walmart - right off the silver wrapper (I did remove the protective tape) and it does'nt work! This got to be a code version issue or a hardware malfuntion. Are there any Lexmark X73 diagnostic tools to see if the PC communicates with the color cartridge etc??