Renualt Megane 53 plate 1.9 dci?

Sum1 used my car to jump start theres and made a electrical fault, fuse had gone, replaced and car was ok the keys card started to play up days later, was due to go and be tested at garage but my turbo went so the car went off the round for bout 5weeks, parked up n Decembers weather (snow) when try to start again it said electrical fault on computer screen please help