cannot start or open doors after battery was changed on 1998 Mercedes-Benz SL500

i have tried to start my car after i changed the battery and now it wont start nor will the windows go up basically no power

Asked by for the 1998 Mercedes-Benz SL500
Who replaced the Battery? Was it you or a shop?
2 more answers
Try the main fuser link
i checked anti-theft lite is not blinking