If I understand you correctly, nothing happens when you plug it in? I'd suspect your power cord first.With an older machine the cords get brittle, and when wound up in storage they can break a wire inside, where you can't see it. Your machine has an oddball type of plug on it...if your husband is handy he can rewire another cord onto the plug and see if it works. If not, I'd start searching for a power cord.For 15 bucks you can buy a new one and test that way..depends on how much you like the machine, if you want to put 15 bucks into it or not.
https://www.sewingmachinesplus.com/elna-cords.php