Make sure the shutter curtain edges are completely out of view to the left. If you can see an edge, try pushing it over slightly and it might pop over and free things up. If not, yup, electrical. And doable by the way.
Also make sure the contacts on the battery are clean. Use a pencil eraser on them. Ditto on the inside of the battery cover. Gently clean the contact in the camera with a swab barely moisted with some alcohol.