I recently purchased a used DualMiner in Ebay (the 1-chip version that looks almost like a Block Erupter, not the big round 5-chip version)(the original version that supports both dual-mode and scrypt mode). When I connected it to my computer for the first time today, Windows detected it and automatically installed drivers for it. However, I am unable to mine with it.

I followed the instructions at support.dualminer.com and installed the software, including replacing the default driver with winusb. However, when I try mining, it doesn't work, and it seems that cgminer considers all devices to be disabled.

I also tried downloading the older version 1.0.0.6 of the dualminer software, but that didn't work either.

I then uninstalled the winusb driver, and reconnected the device so that Windows would install the default driver again, and tried mining with bfgminer 3.99 (the modified version at the cryptomining-blog.com site designed to work with gridseed). BFGMiner seemed to detect the com port correctly, or to start to (the com port it displayed matched the one Windows had shown me when I first connected the device), but then BFGMiner said 'invalid detect response', and it was not able to mine with the device.

I also noticed that no lights came on on this device at any time, not when I plugged it into the computer, nor when I was attempting to mine with it... I know with Block Erupters, the green light lights up when you plug it into the computer so that you can see that it is working and that it is ready to start mining... What about DualMiner? If this device was working properly, should a light have come on when I plugged it into the computer? Or does the light on the DualMiner turn on only when it is mining and finds a share?

Is there any other software designed to work with this device that I can try mining with?

Is there any easy way I can figure out if this miner is working or not? If the miner was DOA, do I have any protection under Ebay policies?

Thanks!