I doubt anyone is open today. What shop did you take it to twice? Check the positive terminal inthe engine bay. I had a similar issue once on my car and it was a badly corroded power terminal preventing the start up.
'02 ///M5 Imola Red / Imola Red '09 335i Alpine White / Coral Red
'04 E55 AMG Brilliant Silver / Anthracite
'96 318i Alpine White / Black
'01 330Ci Titanium Silver / Coral Red
'96 328i Jet Black / Black