From your post 10, you are seeing 200 PSI on the high while running, this is evidence that the compressor is working. Are you still getting 0 PSI on the low side while running?

Is so, the expansion valve is stuck shut and not allowing freon to enter the evap coil.

Some compressors ( my 97 C280 ) are variable displacement and volume is regulated by looking at low / high side pressure. ( maybe just one pressure I don't recall the details )