Defective Cartridge or Printer?

[lyndhurst]

Dell Printer 948/Vista Home Premium

Printer seems to print but a blank page comes out.
There is ink in the cartridge.

Can it be determined which item is defective?  ( Printer or Cartridge)

(Color Cartridge ran out of ink a long time ago.)
(Old style Cartridge, Print head in cartridge.) 

[Rustys]

Have you removed the tape covering the print head?
Have you ran the clean print head feature?
Have you tried a different Cartridge?

[Geek-9pm]

What is the model number?
How old is the printer?
Printers are now very cheap. Some under $35.