EDIT: Mechanic says it was a weak battery. Weird, the car was turning fine just not starting. But he found that the harmonic balancer was vibrating and needed to be changed too but I think it's a ploy to get $$...
EDIT2: He showed me that crank pulley was indeed vibrating and said that it might damage the engine if it goes so I need to get a new crank pulley + idler bearing soon.
It is possible the idler bearing is going. If you know how to take off the belt, do so, and spin the idler. It should spin freely. In fact, spin all the driven accessories while you have the belt off. The alt, tensioner, air pump, air cond, and blower (if you have one) should spin freely. The ps pump will have resistance, but should turn smoothly.
Make a drawing of the belt before you take the belt off. Double check your drawing before taking belt off.
Car wont start again so it was misdiagnosed. Took it to a MB this time and they found fuel pump dead along with a host of related problems. $3100 parts and labor, they wanted to replace fuel tank etc. Was I ripped off or where they right?
//// CHECKED REAR SAM AND FOUND POWER AT REAR SAM FUEL PUMP RELAY AND FUSE//// CHECKED AND FOUND POWER AT FUEL LEVEL SENDING UNIT CONNECTOR, BUT FOUND GROUND PIN CONNECTOR BURNED AND CONNECTOR DAMAGED CAUSING FUEL TO LEAK THROUGH CONNECTOR//////