Hello again, so far it sounds like there is a refrigerant leak causing the problem.
Tell me please if the unit that sits outside is running or not, if it is running and not cooling it could be a refrigerant leak.
Next tell me if blower in the inside is running or not.
If it is running tell me if there is good air flow coming from the cold air vents
.. if not, then the cooling coil may be iced up for a variety of reasons.
Next locate the largest copper tube attached to the outside unit (the one that is insulated, and tell me if it is cool, iced, or sweating.
This is quite a set of complex instructions, be patient with your self, do them one at a time, until you have them all done, then tell me what you have discovered.
We can go from there