you don't need to wait until you have 5,000+beacon.... just press "start packet capture" first & waits until x-term popup... after a few second the beacon start been collected go back to fAircrack menu (without closing the x-term) then press "authenticate" button...then enother x-term will popup giving you a list trying to authenticating the connection... then go back to fAircrack menu again (without closing the 2nd x-term) n press "start package injection"...another x-term will popup...this time watch the x-term(fAircrack do it job).... now some people can start package injection with have to authenticating with the connection while some other have to... you can try both method & see which one is best for you...