No sound through the amp

I have a samsung plasma full HDTV and a Yamaha V463 Amp. I have connected the PS3 to the TV via HDMI cable and the TV to the Amp via HDMI also.
My problem is that the TV will show the picture along with sound but I can't get the Amp and 5.1 Wharfedale system to produce any sound. Is is better to run the PS3 straight to the Amp? If so, how do I get a picture through the TV?

Any help will be greatly appreciated.

First go have **** in wash room and then get that **** and put it on face it will start wrking okay