Mac Pro 2008 no Chime then shuts down

Hi,
Yesterday I shut down my Mac pro and it shut down as normal.
Few minutes later when I tried booting it, the fans would startup then a few seconds later the machine would shut down. Never got to the chime stage.
I removed everything ( the 3rd party ram modules, the graphic card, the E-sata Card, all the Hdds except the main OSX one, removed all USB cords etc ) and tried booting up again. No luck :/
Later I put the Graphic card back in ( But didn't plug a monitor into it ) and tried booting. The first time the red leds came on, the fans started, the Graphic card fans also strated but still no chime. Waited for 2 minutes then I shut it down again. Next try same problme as before - the fans would startup then a few seconds later the machine would shut down. No chime.
Disconnected the power cord and left system off overnight.
Booted up in the morning and I heard the chime a bit late ( this is happneing more frequently last few weeks before yesterday , late chimes on boot ) and the sytem booted up fine, osx loaded fine etc. The third party rams are in but I havent loaded the Other HDDS nor the E-sata card as yet.
I am wondering.. WTH happened ? Will this problem re- occur ? Has anybody been through this situation ? What was their experience ?

I removed the boot drive .. everything ...and tried but the problem still persisted ( even reset the SMC as you suggested )
I had a 8800 GT but that died and so I went back to the stock amd 2600XT that came with the tower. If I could convince the local mac resellers to sell me the 5770 I would. But they insist I must have the 2009 or later mac pro to purchase ( WTH :/ ). BAH !
I have sent the tower for analysis at a local apple authorised service center. Should be getting a feedback in two days time. Will update here when I get some news.
And yeah there seems to be a lot of 2008 mac pro issues lately. Googe throws up quite a few recent ones.
Pity.. was a Solid machine for me 50 months straight

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There is a pram battery but I don't think that's the cause of your problem.
Have you blown all the accumulated dust out of your machine?
Try reseating the video card, maybe the ram too.
Run Apple Hardware Test (boot from your second installer DVD, push D down immediatly after the boot chime).

When switching on my Mac Pro on bootup it keep shutting down then eventually it works fine

When switching on my Mac Pro on bootup it keep shutting down then eventually it works fine

I also have the exact same problem with my early 2008 Mac Pro. Last spring, the video card that came with the unit burned out. I brought it in to the Apple Store in my area, but they were unable to really help me out. I ended up replacing the card, but about two or three weeks ago I started having the same exact issue that you do - the Mac would suddenly die occasionally, and then would take quite a few tries to come back up. It seems that resetting the PRAM helps temporarily with me. It has been up since about 3 PM so far, and it is behaving.
My main issue is that replacement parts are expensive for this machine. If I were to replace the power supply and the logic board, Apple would charge me about a thousand bucks! That's simply too much money to drop on a 4 year old computer.
My solution is that I will run it for a while longer, and replace it with the Mac Mini with the ATI GPU. The Mini is about 85% as powerful according to Geekbench, and if it dies I will not be out more than a few hundred bucks.
I will be migrating all my OpenCL code to FreeBSD as well, because replacing a power supply or motherboard in a generic DIY PC is only a hundred or two dollars at the most.

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3) And the last problem I'm having is in bootcamp. When I play games (Battlefield Bad Company 2 or Crysis) the computer freezes after 3 min or so. The screen either turns blue or black and I have to shut it down. I am able to do the hard restart in Windows 7, in fact I just have to press the power button ones and it shuts off correctly.
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just wanted to update you guys on what the official stance of OWC is on this situation. I had the same problem like you guys. I have the 240GB OWC extreme pro SSD in my Mac Pro 3,1. When it goes to sleep, and i leave it sleeping for a day -- upon returning, it will freeze up with the spinning wheel of death.
This is what they had to say about it:
"While Sleep will work with our SSDs, there have been reports of system hangs in relation to hibernation mode which is the deep state of Sleep. We suggest not using ANY program that puts your computer into hibernation mode when using an SSD. SandForce is working on this issue and it will be addressed in a future firmware update.
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Press: return/enter.
Type: your password when it prompts you to, then press return/enter again.
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I apologize for the inconvenience. I sincerely appreciate your patience and understanding in this matter and hope you will continue to bear with us as our extreme SSD product line transitions through these evolutions and unforeseen road bumps. Please let us know if there's anything else we may do to help."
--I would like to add that the OWC SSD is great. And since Downloading smart sleep and disabling deep sleep aka hibernate, the issue has been totally resolved. Im pretty sure the terminal entry works just as well. But I liked the added convenience of the other features of smartsleep. So there you go guys.

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that is why my approach
clone your system
be ready to restore if needed
don't rely on Disk Utility
have an emergency boot drive / a working clone
keep data on another drive
spare extra drives
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Your business could get a more powerful Mac Pro or upgrade the processors even to 8-core 5355 or 5360s.
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