my wifes trailblazer had no oil pressure so she put stop leak in the engine where the oil goes,so the next morning i changed the oil,filter and sending unit, started car had oil pressure then died ,i tried to restart the car but it wont start,just makes kind of a grinding sound.
Hard to diagnose a noise even when you can hear it. Even harder over a keyboard. Grinding noise may be the starter not engaging all the way or something. Weak battery may be the cause of the issue.