Why does my Canon i-Sensys LBP5000 printer say it cant detect any paper? -

I have plenty of paper in but it says there isn t any. It sometimes works when i switch between A4 and Letter but i don t want to have to keep re-registering it each time i want to print as we need it for the office. Thanks.

this could be just a faulty sensor or the formatter but you will need to get it repaired