I have a detached garage that "suddenly" went dead. I have a sub-panel with 220 and a 50A circuit for my spa. NO breakers were tripped. Went to main panel..again NO breakers tripped. I have reset all breaker switches (turn of/on several times). I believe I isolated the breaker @ main panel that feeds garage..I changed it...it still doesn't work. The breaker I replaced was a double pole/1 bar switch. Any Ideas??