That the power stays at 0 is a known "bug" with the 3945 card, but that doesn't figure.
Tryd using a second box (connected to the AP) and generating Data?
Also try to use your real mac instead of the faked one ( i had some trouble with this sometimes)
Edit: Oh, just saw that step 9-11 should end with wifi0 instead of wlan0 but i think that's only a posting error.
Edit2: Sry i was wrong , i always skip the airmon step, so wlan0 should work for you.
Try to set the ssid too , so your command should look like this:10)aireplay-ng -1 0 -a (bssid) -h 00:11:22:33:44:55 wlan0
With sucess it would say: Association successful!Code:aireplay-ng -1 0 -e <SSID> -a <MAC AP> -h <OWN MAC> wifi0
Then you can proceed your steps.