Mac Pro no longer recognizes Optical drives

I was working on my mac Pro and it suddenly restarted itself. After that happened neither Superdrive would be recocnized by the OS. Oddly it took a very long time to boot, approximately 2 minutes. I have a Apple OEM DVR-111PB and a Pioneer DVR-112D. I disconnected the drives and it booted normally fairly quick. So I tested the two on another mac and the DVR-111PB will not recognize anything put in it. The other one works fine.
So I just installed the DVR-112 only, in the Mac Pro and it took a while to boot up and it still would not recocgnize it.
I have zapped the pram, reset the SMC and attempted to reinstall the upgrade to 10.4.11 to no avail.
Any thoughts on why the OS is not communicating with the drives? I do get the -70012 "A valid DVD drive could not be found." error message when I tried to run the Apple DVD player.
I have an external firewire DVD and I'm thinking I may have to reinstall the OS from it.
Any help would be appreciated. Thanks

After getting into this a little further it is looking like it may be a power supply issue. I ran the extended diagnostic utility on an external firewire drive and everything passed. I measured voltage at the power connector for the optical drives and on the 12V side it is only getting 9.7VDC and the 5V side it is at 4.9VDC. As I mentioned in the OP the drives spin up and such attached to another computer. I'm wondering if the powersupply is going bad and the 9.7V isn't enough to run the drive. I hooked the DVD drives up to an external power supply while the data cable was connected to the mac and viola, the drive is recognized, actually both DVDs are recognized when hooked up in this manner. So essentially the DVD drives are OK as well as the ATA bus.
Now to the power issue. The power supply on the 12V side of the connector seem to vary all over the place, anywhere from 6 to 11.55 volts on the 12V side of the connector. The 5V side is a constant 4.9VDC.
I'll see what I can find for power supply diagnostics. I'm wondering if the 12V comes straight from the power supply or does it go through some voltage regulator on the main board to reduce the voltage to 12VDC. There are 4 connectors on the power supply marked PS1 through PS4. I need to find out what is what. Any input would be appreciated. Thanks.

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