Printer Prints Blanks

[dmw16]

Im trying to fix this printer. Its a Lexmark Z31 and here's what its doing. When I try to print a test page it gives me a color page, but nothing in black text. I cant seem to get it to print. The printer properties says the tank is full, but why wont it print black? Is the cartridge empty?
thanks,
-doug

 

[cleverhandle]

The ink tank gauges on my Z43 seem to lie sometimes. Take out the cartridge and shake it a bit - can you hear any ink sloshing around in there?