Just got my latest order, 2 more gridseeds. They didn't come with power pigtails, but I figured I'd plug them in to my powered USB hub and see what happened. cgminer-3-7-2-gridseed detected them automatically and they started hashing away. cgminer detected them, but they show 0 WU after 10 minutes. The green lights blink, but no red lights like on my working units. The fans aren't running, but I'm told that doesn't matter in scrypt only mode.
Do these no longer ship with power pigtails? Is it official that it's safe to run them in scrypt only mode without the fans?
They still need external power even with a powered usb hub. It will show up in cgminer but it's not hashing. Gaw sells power adaptors and cables. For just two miners you could get a couple of cheap 12V 1A adaptors from ebay like this
http://www.ebay.com/itm/271442451746?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649I wouldn't get those specific ones: "Output: DC 12V, 1000mA. (Recommend the use of current is less than 1A, otherwise easily damaged)".
If say only 0.5A is safe on those, that's 6W. Get a 12V adapter with at least 2-3 amps available I'd say.