Gary, I purchased a PowerMac G5 quad 2.5 computer with Final Cut Pro v. 6.0.5 installed on it. Thank goodness, I made a clone copy of the hard drive immediately after purchasing it and keep the copy in a secure location away from the computer. My problem is that after I install additional hardware (i.e. Sonnet 2port PCIe eSATA controller card) I am asked for the registration name and serial number (which I do not have) when I try to open Final Cut Pro. All my other applications (i.e. Adobe Master Collection cs4, Pro Logic, etc.) continue to operate just fine. Is there a solution to this problem without having to purchase Final Cut Pro from Apple?