A week ago when i got home from work i could smell something burning under the hood. I popped the hood and a bunch of white smoke came out. The car hasn't run since. I replaced the spark plugs, alternator, starter. Something drained the battery so i got a new one. Once everything replaced it still wont start and something is still draining the battery quick. Check engine light is on as well. I checked both fuse boxes and everything seems to be fine. What could be the problem?