occasional no start

Car was making loud squeal, tightening of the wheel while driving during occasional turns with the occasional no start in the morning. No noise, no lights. Not cranking at all. Dead. Boost fixed. Took to a mechanic and it was determined to be a bad belt and seizing tensioner. Alt wasn't charging, and putting pressure on power steering. Had these replaced. No more squeal, no more tight wheel. Still having a no start issue. It appears like the car is dead, turn the key over and no noise under the hood, no lights on at all. Nothing. Boost works fine. It's not often but more often than I l

– occasional no start