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if the receiver does not power on from standby there is a problem like bad power supply or even bad macroprocessor. You need to bring it to a service center for diagnosing. 10-years old receiver, maybe better to buy new one.
Check for nearby wireless devices and move them away.
-If the audio output from the source device (i.e. DVD, CD player) is digital (i.e. PCM, DTS or Dolby Digital) you're on your own.
I'd be willing to bet the output is analog (red and white RCA), because the
"beeps" and "exploding sounds" you describe seem like it could be caused by interference. Try replacing the cables. Otherwise the issue is probably with your receiver.
If your tv is putting out mono you will only get the center and sub speakers. This can be because the tv is only mono, or the output is set to mono in a menu of the tv. If you have cable or sat run the digital audio out to you receiver; it usually sound better that way anyhow. Set your receiver to Dolby mode for best sound.