I have a similar problem. Green Light comes on, speaker even makes a popping noise if I unplug it while the volume is turned up, but it does not work when plugged into my receiver. Took it apart and the board closest to the power supply looks like it has some overheated D batteries. Is it possible to buy the second whole board and replace it?

Since you have said the speakers make this sound when "turned on", I'm going to assume there's some form of power amplifier attached (internal, external or otherwise). Based on the minimal information provided here, this simply sounds like the normal reaction of a speaker when the amplifier is turned on. In short, an audio speaker is a type of "transducer" and when power is applied (thru some form of amplifier), the cone reacts to the power surge and causes a thump, pop or other noise. Turn on your TV for example and you'll usually hear a small pop from the speakers...and a larger/more powerful amplifier is likely to make a louder noise. Without further information, in most cases this is quite normal.

Assuming there is an external power amplifier, my advice would be to turn the volume on the amp (regardless of whether there's a receiver connected) to 0 before turning the power on. If it still makes such a noise, it's possible the volume control of the amp may require cleaning.

Good Luck!

A popping sound is usually caused by a failed power supply. Because of the possibility of fire, unplug the TV and call a service technician or, it the TV has some age on it, shop for a new one. Check out the Consumer Reports ratings before buying a new set. You'll get the best quality TV that way.

No solution i'm afraid. But i have the exact same problem. Terrible cracking interference. Unplug everything else in the house and they still crackle. Very annoying. Decided to buy a new woofer on ebay as that seemed to be the problem with possible faulty switch, but the new woofer has a different connection for the volume control. Incredibly frustrating. If you have any luck let me know. Bose want eighty quid to repair...

Sounds like the speakers are not plugged in to the computer, or are plugged in to the wrong socket.

The speaker socket on a PC is usually green, a 3.5mm stereo socket.

Is it plugged in with a 3.5 millimeter jack? If it is, pull it out of the computer and press you thumb on the tip, if no humming noise comes out, your speakers are probably blown.

However, if a humming noise does come out. Please check to make sure the volume on the computer is turned up/unmuted, the software's volume is turned up/unmuted, your sound card driver is installed (Right-Click "My Computer" -> left click on properties -> Click on the Hardware tab -> click on "Device Manager" -> Click the "+" next to "Sound, video and game controllers" and make sure there is no Red "X"'s or yellow "!"'s.

If you do get a hum, and you do have everything set up right in Windows, try a different pair of speakers or head phones. Your sound card might be fried.

Also, make sure you're plugging the speakers into the correct port on the computer (It's usually a washed out green port"

open volume control & remove check from mute button.

start-program-acessories-entertainment-volume control.

this is the amp IC and while unplugging and plugging it in again helps reset the IC for a little while , it will eventually completely quit and will need replaced
make sure that none of the speaker wires(bare wires) are touching or look like they might be where they are connected at
also if turning up the volume makes it cut out or sound bad then this will also indicate a bad amp IC

Same loudness, no speaker? This sounds (no pun intended) like a filter capacitor shorting out. Open it up and VERY CAUTIOUSLY look for what is making the noise. Filter capacitors can eject hot stuff. Very dangerous.

i had the first problem and you can probably fix it by turning the volume knob all the way up and down about 20 times. it worked for me. supposedly the potentiometers in the z-5300 get dirty or worn out, somehow this might fix it. for the second problem maybe try plugging it into the laptop and unplugging it again seeing if it goes back to normal?maybe its a problem with the amp?