My (marantz pm - 26) amp won't come on?

I got this amp (marantz pm- 26) from a friend and took it home and plugged it on, it came on and everything seemed fine. However after battling with the connections and getting no sounds from my speakers i gave up and went to bed. The next day i decided to give it a go but to my suprise the amp wont come on..Did i in messing with the connections, inadvertently fry something? It was certified working prior by a friend who happens to be a technician.