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If it's ON and the compressor still doesn't come on, you need to hire a professional. Could be a problem in the thermostat or the compressor unit could be bad.
Also depending upon the thermostat you have, some have a delay switch built in that prevents the unit from running for a short period of time and if the thermostat becomes faulty the unit never operates.
Another reason is low refrigerant gas in the system. If you find that you needed to add gas to the system every year or so a leak may have caused the refrigerant to leak out to a point that the safety pressure switch within the unit has shut it down to prevent damage to the compressor within the system.
Now with the issue of some vents blowing and some not. I assume you only have one cooling thermostat? Or do you have more then one? How many outdoor units do you have also? If you have two or more cooling stats and only one outdoor unit, your system is zoned. When that happens, one of the zone thermostats becomes the main switch that determines if they are all set for cooling or all set for heating mode.
Normally the one that is located in the dining room or main hall controls the functions of the system.. Be sure that its set to cooling mode and then check again.
Some zone systems require that a switch elsewhere be turned to summer mode, or cooling mode. This switch is oftentimes found at the top of the basement stairs or next to the heating and cooling system.
So if you have a zoned system that could be the reason why only a few locations are not working as they should.
Provide some more information about the system, such as number of thermostats, number of outdoor units. Age, location of cooling fan, attic or basement/crawl Is it connected to heating system or independent of the heating system. etc. Knowing more can help figure out what you need to do before you call a service tech in.
Glad you are up and running!