Eleven Rack and output to speakers

[sricabla]

All of a sudden audio is not going out to speakers in PT 10 and out of PT, What's up? I go to System prefs and select 11 rack on Output and Input but still no output to speaks. I can hear in headphones but not in speakers. I know the speaks work because when I restart, I almost blew my speakers with the loud click that they had. Any help would be greatly appreciated.

Thanks in advance