Unable to sart Car

There too many possibilities and too little info to answer this question. A diagnosis needs to be performed, which means checking the diagnostic trouble codes, fuel pressure and ignition to the spark plugs, just to name a few things. Here are some shops in your area the work on Nissans: http://repairpal.com/directory?distance=10&sort_by=relevance&address=paramount&car_brand_names=Nissan