I have tried cgminer with this string:

cgminer.exe -o stratum.btcguild.com:3333 -u dogie_U3 -p 123


result: No devices detected!

Same problem with the new U3 i got.


No one of my two purchased U3 was sealed originaly with the round adhesive dot. I can see remains of this Dot ( adhesive on the first Box and a half Dot on the second Box).
To seal the box for the new buyer they have used a narrow adhesive tape.
So i'm not the only one with this U3 problem.
Probably the U3 i've got from Amazon.de have done at least two rounds (Amazon > purchaser > Amazon > purchaser > now from me back to Amazon).

General problem with the U3 or just my problem becaue got no originaly sealed unit?