First of all make sure that the printer hasn't become disconnected and still has power.
If the printer is infrequently used or hasn't been cleaned in the last 6 months then the printer head may be blocked. In some cases the installation of a new cartridge can create exacerbate an existing problem causing the printer to stop printing altogether. In this situation the use of a printer cleaner cartridge will clear the problem.
In the case that a cleaner cartridge is unavailable for the customers particular make of printer then an old cartridge can be converted using a Printer Flush kit with the requisite syringe, drill and plug.
We recommend a JR Inkjet product - to get all the bits and pieces you will require to start with, you should go for JRBLKKIT - this contains a bottle of specially formulated detergent, as well as a bottle of black ink. You could fill up an old cartridge with the detergent, clean your print head, then fill up the empty cartridge with the black ink.
How do I unblock a printer nozzle? A good way to use a cleaner cartridge to unblock a nozzle is to draw a rectangle, almost the full size of the page, in paint and fill the rectangle with a colour (eg...