hi,thx it startet working, eaven if i dont know why....
du you think a Hasrate of 0.63 is okay for my system?
thank you very mutch for answering so fast^^

Im nearly sure that my problem is just totaly simple, but i have no idear what the problem is.
My GrKa is an R9 280X Tri-X by Sapphire and my cpu is an fx 6350 just factoryside overclocking. I hope this helps. I gues ists sometihng with java, because minecraft is alsow not runing properly. I got the newest Version of java and im using bitcoin client v1.6.1 .

This is displayed if i hit the engin on button:

2014.10.12 [19:24]  No devices to start! Please connect mining hardware to USB port(s) and use devices menu to probe for them.
2014.10.12 [19:24]  Uncaught exception in thread AWT-EventQueue-2 scala.runtime.NonLocalReturnControl$mcV$sp

thank you for all answers.
greets A SQUAD LEADER