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has there been any wiring changes or thermostat changes?
and if so was the power turned off to the furnace?
and are you willing to check something in the furnace for me?
look inside furnace for a circuit board...on this board look for a fuse like found in car...called a blade fuse...see if this fuse is blown
you can use the paperclip at top of dialogue box..or a file share site like tumblr or flikr or mediafire.com
how about you just get me make and model number and I will supply the pics.
On this pic http://f01.justanswer.com.s3.amazonaws.com/sJYgrG9K/image0.jpg
where the thermostat wires attach to the square block...locate R and W....use a short wire or paper clip shaped in a U...hold one end on R while holding other end on W.
Tell me if furnace does anything
Leave wires attached
before I conclude on a part....cross R and G...does blower come on?
It sounds like a limit or loss of transformer. There is one way to test to be sure...do you have a meter?