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The first thing is to go up and remove the cover and verify whether or not the compressor is actually coming on or not. IF it is, see if you can see any signs of oily residue on any of the lines, especially around the compressor. Then get back to me and tell me what you found and we ca n go from there. Please include the make and model of your A/C. All follow ups are included in our fee.
O.K........let me know once you can get up there and observe the compressor.
O.K........one reason why this site is so popular is that it saves money over going to the shop. It doesn't work for everyone. You can ask for a refund.