Also check the BL3000's are set for 'audio' not 'video'.  You can daisy chain the speakers.  If yçu have any non-amplified speakers, try them in the DIN speaker outlets and see if you have sound.

Try the 'Mute' touchpad when you have the speakers connected in case the mute function has been activated.

OK, just now seen your picture and the 2 lines for volume mean the mute circuit is enabled.  Press the mute section of the control panel and you should hear the relay click and sound appear.

Dave.

BL are set for audio, not video. 

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I have pressed mute several times. Mute appears on the BM4500 display but no relay click and no sound. 

Does this happen when you try the other BL3000 speaker?

I think this is a muting issue.

Dave.

yes, the same

I just ordered a "Minijack top beolab Line In (using Phoneo/RCA sockets) - one cable for two speakers" from soundsheavenly, just to see if the speakers are working. 

Is the muting issue common?

is this the right setting? 

I understand the Left and Right option on top. But what are the second switch about?

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If the relay isn't clicking when pressing mute, it could be a faulty minijack output on the BM4500, that makes the speaker relay stay activated all the time. I had a very similar problem to yours on my BM4500, which turned out to be mechanical failure in the minijack output. Luckily I had a spare part lying around, but simply unplugging the minijack output in the BM4500 should also do the trick although I wouldn't advise you to start opening your BM if you're not quite sure, what you are doing. 

On a little side note, you should be aware, that the tape holding the glass panels in place tends to dissolve over time, so if they haven't already been reattached, you should get taken care of that as well. Take a look

The minijack output, is that the tiny socket on the front of the BM? So the minijack output thinks there are headphones plugged in and cuts out the speakers? Do I need special B&O headphones or can I plug in my iphone headphones and try is there is any output?

Thanks for the heads up about the glasspanels, I have that sorted before mounting it on the wall. 

Yes, that's the one on the front. You don't need special B&O headphones - any with a standard 3,5 mm minijack plug should work, but I don't know if the iPhone headphones will work, since they have a remote control feature if I remember correctly and therefore a different type minijack plug with more connections. 

/Dennis

I don't know how common a muting issue is.  All I know is that on my BM4500 if it is playing normally and the Beolab speaker display is complete, when I press 'mute' the volume number is replaced by the two horizontal lines as shown on your BL3000's.

What kind of set-up was the previous owner using?  Was it linked to a TV or any other equipment?  Do you have a remote for the system?

The second switch is related to the power output of the amp/TV used for the speakers.  In your case, as you are using Powerlink - not Speakerlink, you don't need to worry about it as it's overridden when Powerlink is used.

It isn't a speaker problem.  It is a BM4500 problem clearly.  You could try a 3.5mm jack in the headphone output and take it in and out a few times to see if it free's anything.

Dave.