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It sounds like there may be a short in the headset. If you are just
touching the ear piece and then you hear nothing on that side. If that
side has been damaged at all you might want to check for manufacture
cracks or loose wiring. If your Plantronics Backbeat 903 is still under
warranty you should be able to get another one.
Try pressing the brackets that hold the earpiece in place, back together. This is the best I can tell you. I don't know where the crack is located at on the headphones. If you want to go this far, you can try to glue or tape the crack in place, but this is only if you want to try this. I say, if you are still getting quality sound from the headphones, then the headphones are still doing its job,
The 500A base station is definitely compatible with the 510 earpiece. If the earpiece is turned off or unpaired the base station's red power light will be flashing. If the earpiece is already off, try turning it on by holding down the little black button on top. The base station will automatically try to find the earpiece and the blue light on top of the base will come on. If the earpiece is already on (slow flashing blue light on the mic boom) turn it off and back on again and wait for the base to find it.