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  1. Suddenly the microphone on my CM Ceres 300 headset, which previously worked just as it should, no longer works at all - I've now tested it on three computers, one a desktop running Linux Mint 18.3, and a desktop and laptop, both running Windows 10 v 1709. No problem with the headphones, which work quite well on all these boxes, but I can't get the microphone to work on any of them. I tried to register the product in order to file a ticket, but unfortunately the sticker with the serial number, which seems to have been attached to the back of the volume control, has fallen off, rendering it impossible for me to find that number. I do have, however, a copy of of the purchase receipt, which shows my order number and the retailer's product number - but alas, not the serial number - which I should be happy to upload in order to demonstrate authenticity..... I have note that several other users have posted about the same problem, which doesn't seem to be uncommon for this product ; are there any general recommendations which might help me troubleshoot this situation ? Henri