I used the quick-install DVD and I have the same problem. I have tried pressing number keys and holding down shift during boot.
Pressing the number 3 takes me to a console logon prompt briefly and then immediately returns to the black screen. I never saw the AV Wizard and I cannot get it to start.
I will be trying the CD installation method, which is disappointing considering the time advantage of the DVD.Update 8/17:
CD installation also failed with a similar result. See my post on the thread
Still having trouble with black screen at startup