I just bought a used dual 3GHz quad-core (8 cores total) Mac Pro (MacPro3,1, early 2008).
There are numerous problems with it, including that it comes with the dreaded Mac Pro RAID Card installed, which I've read often fails. But the deal breaker is a problem I've discovered with the optical drive. It's the PIONEER DVD-RW DVR-112D, aka Apple's superdrive.
With this drive, I'm having no problem reading from and writing to CDs and DVDs. But I'm unable boot from a CD or DVD with a valid Macintosh operating system. I've attempted to do so with Apple's stand-alone Leopard installation DVD and with DiskWarrior's latest version CD. When attempting to boot from the DiskWarrior CD, the Mac thinks about it for a moment, backs out and then repeats the startup chime and starts up from my internal drive's system. And attempting to boot from the Apple Leopard DVD doesn't get much further before causing a kernel panic.
I bought this on ebay. I hate to have to return it and go through the whole process of finding another used Mac Pro, but I think I may now have to. But if there's a simple solution to my problem that I haven't thought of, I'd like to know about it and give it a try.
It doesn't make sense to me that the optical drive can read and write but not boot, so my guess is that this indicates a deeper problem with the computer.
Any explanation for this behavior? Any thoughts on a solution? Thanks!