I also posted this on the iMac section because I suspect it is more of an iMac problem. But maybe someone who doesn't read that section will have any ideas. I am totally at a loss as to how to proceed.
I bought the Snow Leopard disk about a week ago to install on my 17" iMac (2ghz Core2Duo, 3gb RAM). First I tried to do an upgrade from the Leopard that was already working on the machine (10.5.8). No go:
Yellow exclamation point about 5 minutes into the install. "Install failed. Mac OS X could not be installed on your computer. The installer could not copy the necessary support files."
Since then I have done the following (pretty much in the following order):
1. Called Apple and they sent me a new Snow Leopard disk. Same result.
2. Talked to local Apple store who said it was almost certainly a DVD drive problem.
3. Tried installing from an external USB DVD drive. No luck.
4. Reset PRAM. No luck.
5. Erased and reformatted the hard drive (disk utility from the Snow Leopard disk). MacOS/Journalling/GUID, one partition. Zeroed the drive. Still no luck from the internal DVD drive.
6. Used my MacBook Pro (i5) as an external firewire target disk. As before, iMac initially booted from the 10.6.3 disk, got through about 5 minutes, no luck.
Keep getting the same message. I am totally mystified. Any suggestions.