did i just blow something up??

[nothing.sound]

just plugged in my rogers hi-def cable box. I've recently hooked up a new speaker system and all of my home theatre components into a power conditioner. I hooked the cable box up and watched it for about an hour when all of a sudden the speakers popped and than started squealing really loud. I still had a picture at this point but a minute later it went to a gray screen and my rogers box was screwed up. Am I using to much power for the line conditioner.