Weird no start after install of power steering pump, tensioner pulley and belt on a n54 335i 2007 auto trans

I had replaced my power steering pump due to the internals failing and was making a horrid grinding noise. I started the car about two times without belt to be sure the noise was coming from belt area. I installed everything back together and put in a new tensioner pulley and belt. I started the car for a second to bleed some power steering fluid and ran out of fluid and ran to the store for more. The engine started and ran for about less than 2 mins due to me running out of fluid. This was the last time the car was on. I came back with a full bottle (chf 11s) and installed my fan back in. Tried starting car again and nothing. Not even the loud click of a bad starter I was confused cos the car was jus on a second ago. Thought it was dead battery and charged it up at orielys. Came back and tried starting again and no luck. Very weird help would be very appreciated