I own an HP 5940 printer. It worked perfectly for 4 months then it started having problems.

It is no more able to get the paper to print on. It try but the sheet is never grabbed.

My father is sure that is a matter of cleanness because he once cleaned it and it started working again...

However I don't think so.

Some minutes ago, while I was trying to push some sheet in it, it hanged. Now the sheet is blocked inside.

This get me angry!