My HP 540 monochrome printer has just decided it does not want to put ink to paper any more. It prints as usual but the result is a completely blank piece of paper. The cartridge is
almost full. I have tried the following:
Removing and cleaning the cartridge including the contacts.
Dusting out the whole printer.
Printing an internal test page while disconnected from computer.
No error messages are ever produced.
If anyone knows if its a broken component then please could you tell me what exactly since I'm quite handy and could probably fix anything mechanical and minor electronics myself.