Yes that was the issue - OS / hardware incompatibility that I suspected would happen.
And indeed, getting the DL to work on the Macpro was only to confirm that it is indeed a video card problem, before I splash out on a replacement.
I will just go through the exact symptoms below to get any opinions if my diagnosis of faulty video card is correct:
1.Press start button and familiar chime
2.Apple logo appears.
3.Rotating progress ring for about a minute or two below apple logo.
4.Progress ring stops, screen flashes and goes totally white, then nothing more.
I have also verified the HD, no problem there, and the above also happens even if i try booting/re-installing from a bootable pendrive installer.
My theory is that the video ram on the video card is burned, but as I said I wanted to eliminate all other possibilities before buying an new card and the DL option was one way of doing so, if I could only get the driver on to the Macpro's boot drive!
I wish the developers at DL would find a way to allow installing the DL driver on to an external boot HD.
Once again, thanks for your input!
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