Why is my printer is not printing properly?

My printer is only printing certain lines on the page, i.e. in a printed page of text it is missing horizontal lines out. These do not correspond to particular lines of print - they just look like gaps. Almost like when you're painting a wall with a roller and the paint is not evenly distributed on the entire surface of the roller. Does anyone know what I mean and what I need to do to fix it?? Any advice would be much appreciated!

  iscanut 12:02 26 Apr 14

Firstly, a word of advice. Do not ever use your email address as your login name. You might invite all sorts of unwanted emails ! Change your user name to something else. Secondly, we would like to know your printer model and also your operating system.

  lotvic 12:05 26 Apr 14

Run the 'clean print head' cycle on your printer, one or more nozzles may be blocked.

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