My A/C stopped working yesterday morning

. When I got in the car and turned it on it worked fine for about one minute and then the Econo light came on and the A/C hasn't worked since. I checked the pressure of the low side and it read over 100psi. I know it should be around 40psi with the system on high, but what should it read when the compressor isn't running? It has always blown ice cold before this. Any help would be great since no A/C isn't cool in Florida. Also, I would imagine the system isn't leaking if it is holding over 100psi....what do you guys think?