Model number 795.72489411 is not cooling at all.. initially put it in and out of store/demo mode 5 times and it started working! Worked for 3 days perfectly and now won't do a thing :( Re-tried turning on/off with demo again, but does not work. Compressor does have a slight hum ; no clicking noise.. fan on back is running.. Where do i go next? Repair won't be able to come out for 3 wks!! Thanks