A.c. wont turn on

Question

i have a flat panel of buttons and none of them work. the a.c. wont turn on. so i test the reset button on plug and it seems to wok properly.then if i unplug the unit and plug it back in, it counts to 24 and then it shuts off. i have tried pushing buttons while it is counting and all it does is stops stop counting. the other day while it was still working i tried to adjust the thermostat and the up and down arrow didnt function. please help i live in texas and its hot.