Problem about buzzing noise from speakers....

Hi every one,
I have question about the buzzing noise from speakers .....!!!
As I just hooked up my system :
WILSON SHOPHIA 3 SPEAKES
PASS LABS X250.5 POWER AMP
MCINTOSH C50 PREAMP
OPPO 105D BLU-RAY/CD/APPLE TV
MIT SHOTGUN SPEAKERS CABLES "brand-new"
SHUNYATA STAIR/ANTARES XLR CONNECTION "brand-new"
SILNOTE POWER CABLE for all components "brand-new"
MONSTER AVS PRO 2000 power ..
I don't why when I turn on the power amp first then I hear the buzzing noise from speakers it was not loud but you can hear if your ears very closed next to speakers then I turn on the preamp next, the noise go away but you still can hear the buzzing just very little.!!!!.
Can you tell me what is that problem and what I have to do !!!!.
Or do I need more time to burn those cables ! Do I need to burn at least 50 hours ...then the sound will be improve and better as they are supposed to be right !
please let me know 
thanks in advance