Sticking button

Question

I put some batteries in my camera that hasn't been used for a while, then pressed the button which advanced the winder from the ''S'' position to the first frame but then it jammed.I opened the back and put in a film then closed it which retuned the counter to ''S'' but on pressing the button nothing happens.The batteries are new, and when you look through the veiwfinder it is just dark with no images. In the top left hand corner is the number 1000 lit up in green. Is this an expensive fix as I would like to sell the camera and accesories soon.

regards pete