I was told my wires aren't "grounded". What does that mean?

[Wash. state Desk Jet]

3. You need to be a little more specific about what

you were told and by who. If for example your house has old wiring before the ground wire was added into code, than all electrical is grounded by house ground-grounding poll. That means your wires are grounded . Some people replace old recepticals that only except two prong plugs with the newer plugs with ground -or your three prong plug. If thats the case and your house wiring is old, than a tester will show you are not grounded, which means there is no additional ground .So it all goes back to the house ground.