Mac Pro won't power optical drive or internal hard drives?!?!?!?!

I'm in a strange predicament. I've acquired a used 2006 Mac Pro that I've gotten to power up just fine. I get the start up chime and the screen goes grey. The problem is that it will stay on that grey screen for 5 minutes or so until a flashing folder appears. It never loads the OS. So I've loaded the OS on an old Firewire external HDD and the computer will boot fine off of that. When using the external, I've noticed that System Profiler is not detecting my internal HDD or optical drive. I do not think they are receiving any power. They both show no signs of activity, functionally or audibly. I've tried reseting the SMC, zapping PRAM- even swapping power supplies. Nothing. Any ideas? Thanks in advance.

Hi Grant Bennet-Alder. The HDD and optical drive are both installed and all the cables are connected to both the logic board and the devices themselves. The reason I think they aren't receiving power is usually you can hear some activity from them. These seem completely dead but work fine in a different computer.

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RE: SATA Bus speed:
Typical Rotating drives available today, whatever their SATA spec, can source data off the spinning platters no faster than about 125MBytes/sec.
SATA 3 is rated at 6G bits/sec, which theoretically is about 750 Mega Bytes/sec
SATA 2 is rated at 3G bits/sec, which is theoretically about 375 Mega Bytes/sec
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https://discussions.apple.com/message/22690384

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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.
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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.

Mac Pro won't power up

I'm running a Mac Pro, 2.66 with 2g memory. The only "custom" modification I've made is to add a second hard drive and partition it for Windows using Boot Camp. I did this shortly after I got the machine (a couple months ago) and it has worked fine since.
We had a power outage locally, and my Mac would have been in sleep mode at the time (I was at work). I have the Mac plugged into a UPS (though I'm not 100% certain of the rating, I bought a fairly large one). The power outage was due to a storm, though the UPS has surge protection also.
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However, once shut down, the computer will no longer power up. It often clicks when I push the power button, and there's a faint sound / electrical hum like it's going to turn on, but no fan / hard drive noise.
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I have tried both methods of resetting the SMC (all cables out, plug in, power up, and the second method of opening the thing up and hitting the SMC_RST button, which I've done both plugged in and not) and that doesn't appear to be working.
When I hit the power button, it's obviously getting some juice (lights flicker), there's a click and a faint electric whine, but neither the fans nor the drives start up.
The only other oddity is that two of the LEDs flash red when I hit the SMC_RST button, but they're not on or flashing at any other time.
What confuses me about the issue is that the front power LED was on when I first got home, so it wouldn't seem like it could be a total absence of power (and indeed the flickering of LEDs upon pressing SMC_RST seems to indicate that there's electricity somewhere, at least). However, I can't get fans or drives or even the front LED to light.
I've moved the computer off the UPS and to a different circuit, repeated all SMC_RST steps there, and no luck.
Is there anything that prevents even the fans and drives from starting? (Like, if I don't plug in the keyboard or display, should it at least power up and beep? I've tried with these things plugged in and not plugged in and it doesn't seem to make a difference...)
Thanks

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US$25 will buy you 100 of those batteries:
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Blame it on FBDIMMs that are dual channel DDR2.
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How To Install and Remove Memory Mac Pro
https://support.apple.com/kb/HT4433
2008 Mac Pro Memory Arrangement
http://eshop.macsales.com/Customized_Pages/Framework.cfm?page=install_videos/mac pro/macpro_quicksheet.html
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667MHz FBDIMMs are cheap, excellent and 4% 'hit' you would never know about.
http://www.barefeats.com/harper5.html
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Other configurations of DIMM pairs are still compatible with Final Cut Studio, but may not achieve the same performance levels as when DIMM pairs are installed on both risers evenly.
Riser A contains:
Riser B contains:
2 x 512MB
2 x 512MB
2 x 1GB
2 x 1GB
2 x 2GB
2 x 2GB
4 x 512MB
4 x 512MB
4 x 1GB
4 x 1GB
4 x 2GB
4 x 2GB
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Reset SMC.
http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".

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MacBook pro won't power up! Acting asleep, black screen, fans don't fire up. Light nr catch pulsing, have taken batt out and reset but still blank screen, help!!

You may want to try this.
Solution A
Start up your MBP while pressing Option (alt)|, Command, P, R until your hear 3 chimes rather than 2 as indicated by apple. This worked for me the first time.
Solution B
Start your MBP while pressing Option (alt), Command, S
Hold until you see the computer automatic routine. When it finally stops type the following followed by "return":
fsck -fy
It will probably indicate some problem related to "pcscd.pub" (should be 16 instead of 17). I haven't figured out what this means but somewhere in the Internet i read it is related to scan cards...
More importantly this routine will fix any problems with your HDD similarily to disk repair. When it ends, it will tell you if it has fixed/modified anything. If it has, run the routine again by typing again "fsck -fy"
Lastly, reboot by typing "reboot" (followed by "return")
Solution C
Start up your MBP while pressing option (alt), command, S
hold keys until you see computer commands scrolling
when the routine stops type the following, each line followed by the "return" key:
mount -uw /
chmod 775 /
chmod 1775 /
reboot
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best of luck

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http://support.apple.com/kb/ht5137
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http://support.apple.com/kb/ht1430
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Mac Pro won't power optical drive or internal hard drives?!?!?!?!

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