Pink noise whine hiss on Levinson 333

Please help. My ML333 amp makes a pop sound on the speakers when switch to ON from Standby -- I can hear the relays clicks inside the amp then follow by the pop (sometimes it pops going to Standby from ON). Worse yet, when it's IDLE (amp ON but not playing music) I can hear the amp puts out pink noise on the upper-mid and high drivers (my guess is 2kHz and up) when I am 2 feet away from the speakers. The noise is there with or without the preamp connected. Does anyone know what are the problems? It shouldn't be the from the main power line because I don't get this problem on my Denon home-theater receiver. Thanks in advance.