The unit was working great day before yesterday. Last night we turned it on and all we got was a humming/buzzing coming from the unit. I felt the center above the fan and it was warm to the touch. The blower in the house was working I assume that has nothing to do with the ac unit. I checked the house power panel and everything is good there. I know it's getting power due to the hum/buzz. Is there anything else I can check or am I headed down the big bucks repair highway?