Classe CP-700 owners - won't play - AC Volt Error

I received my new / demo Classe CP-700 pre-amp unit yesterday....but when I went to set it up - the display read - '' internal protection circuit engaged - AC voltage error ''....I have hooked up at least different three pre-amps in the past at this very same outlet with no prior problems......I took the pre-amp to different outlets in my house - and the same display was shown ....in other words - it dosen't work. The dealer had closed by the time I had reached this point....am I doing something wrong here ????