You might try cleaning the contacts on the back and the part on the printer also. And if you call lexmark it has a one year warranty
1-800-Lexmark
Tell them whats going on and they will prob send you a new printer within about 48hrs
Lexmark Z23 printer has stopped using its blue from multi colour cartridge. I have removed one new cartridge and replaced with another new cartridge. I have made it clean itself and align.Have installed latest drivers from Lexmark but driver in device manager is always
C:\WINDOWS\system32\Drivers\usbprint.sys, although I have updated driver lots of times.
I have manually cleaned the bits inside that I can easily see but no further.
Is this ;printer as good as dead?

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic