FCP 7 Crashes after install of ATI Radeon HD 5770

Question

FCP 7.0
MacPro1,1
Mac OS X 10.5.8
Darwin 9.8.0
(2) Dual-Core Intel Xeon 3 GHz processors
(Memory:          4 GB)
(2) 500GB internal HD's
(2)  500 GB external HD's 
Graphics Card: ATI Radeon HD 5770
  Type:          Display
  Bus:          PCIe
  Slot:          Slot-1
  PCIe Lane Width:          x16
  VRAM (Total):          1024 MB
  Vendor:          ATI (0x1002)
  Device ID:          0x68b8
  Revision ID:          0x0000
  ROM Revision:          113-C0160C-155
  EFI Driver Version:          01.00.436
Random unresponsive mouse, keyboard, and software when working in FCP.   The system would freeze and my only remedy was to shut down.   This would only happen when editing video.   I assumed my ATI Radeon 1900xt grapics card was the culrprit. 
Ordered and installed the ATI Radeon HD 5770 upgrade from apple.  Trying to open FCP after the install, but FCP was blocked from opening for 3 reasons  1.  “Final Cut Pro requires that your system have 128 MB of VRAM; this system has only 0”   2.  Quartz Extream compatiblity and the minimim pixel height on my display was under under 800 (768) 
I restarted the computer and reset PRAM (hold option, command, P & R keys down all together when you restart). Wait until you hear the second chime before releasing the keys.   This didn’t work.
So, I trashed preferences.  That didn’t work.
I opened up Applications, control click on FCP, “Show Package Contents”  Contents/Resources and opened "minsys.plist"  and set the minimum VRAM, Quartz Extream Capable, & Screen resolution all to “warn” instead of “block”.  This allowed FCP to begin it’s launch, BUT FCP  would then hang on the Looksuite Plugin and not open. 
So, I then uninstalled LookBuilder & removed the plug in.  FCP would then open. BUT immediately after setting my timeline preferences to Apple ProRes 442 LT  FCP crashed with in seconds. 
As a work around I tired creating a new user with admin privileges but to no avail.  FCP still crashes.   with this error “ Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000” 
Any direction would be very much appreciated.
Thanks,
Justin

Answer 1

> I purchased my rig with FCP and other programs already installed.  I don't have install disk's for FCP.  When I upgrade to SL, will I need to re-install FCP as well, or (assuming I have no other problems) can I upgrade the OS with out installing FCP again?<
The previous owner is going to be in trouble in the afterlife but you're going to be in big trouble when you attempt to upgrade FCP. You will be able to purchase FCPX, from what we can tell, without your serial numbers.
The general advice around here is to do a scroched earth total erase and install of everything when changing operating systems. In all my years of runing FCP on my Macs, I've never done that. I've alwyas just run the OS Update script and I have never had a problem with this method. I do, of course, make a clone of my system drive before attempting major changes.
If you do an intialization install when you get Snow Leopard, you will need FCP disks. Whoever you bought the rig from stole them from you.
bogiesan