I have Harman Kardon AVR 225 and when I turn it on and use the on screen display to make sound adjustments and or speaker size adjustments, the on-screen display starts to fade in and out. but after a few moments this fading in and out ends. but somtimes returns when I adjust the DSP SOUND MODES i.e. STEREO, THEATRE and or 5 CHANNEL SOUND. Also there is a low hum in my speakers at various times when volume is up but dissapears after the amp warms up . ANY feedback would be greatly appreciated.

thanks kobster511

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