Well SM couldn't help me so I installed a new 10krpm drive and a new 10.6.2 and PP2010 installed. So I really don't know what the problem was but it's OK now. My new Mac Pro is not connected to the net yet so I haven't upgraded to 10.6.3 yet - just getting everything set up.

What I did find out was that the Mac Pro will not let you install any version of 10.5! If you really want it you have to beg support to send you a special version of 10.5.8 and they will charge you $35 US.