You need to provide more information so advise can be given.
Is the ventilation fan operating ?
How do you know the refrigerant pressure is good? What pressure at what temperature ?
The compressor cycles.... ? With the climate control console OR electrically jumping ?
Why did you replace the HP CO switch ? Continuity or no continuity with system pressure present/not present ?
You will need to do some electrical troubleshooting.
Please provide vehicle information in your Profile.