I have a Ruud air

Question

I have a Ruud air unit model number PX402. we had lost power dur to Tropical Storm Fay, when the power came back on the fan will run but the cooling system won't do anything, if it is in the off position it makes an intermitten buzz. The word Malfunc. came up on the screen where you view the temp . There is a little black switch in side the cover is this a reset switch.