What power supply are you using?  12 volts at 1mA is not the same as 12 volts at 1A.  In scrypt only I've been able to run these with 12V 1.5A power supply, but prior to the updated cpuminer the same power supply would not work cause the BTC cores were switched on as well.  Note that the miner will connect to windows and show up in device manager without the power supply connected at all.  All will look good until you fire up cpuminer and you will not find any shares.  The same happens with underpowered power supplies.  The fans on these suckers use a lot of power as well and if mining scrypt with proper cpuminer I don't think they are necessary but I am too chicken to test.