Why is this iMac shutting back down 10 seconds after boot?

OK, I've read some of the other similar topics to this one, and I'm just not able to figure this out. I'm working on an iMac DV at work that we wanted to put OS X on. Midway throught the installer questions the machine just shut down. Now when we try to boot, it gives the start up chime, then shuts back down about 5-10 seconds later. It doesn't matter if I'm trying to boot from the hard drive, the OS X CD, or as an external Firewire target disk. I've tried resetting the motherboard, checked the battery to see that it's still at 3.7 volts, and this weekend I tried swapping the Power/Analog/Video board after reading that the Flyback transformer on the board can fail and cause this, but the problem persists. Any ideas? Maybe the logic board has failed? I'm stumped, and I welcome any ideas from you folks on what it might be. Thanks in advance.
iMac DV Mac OS 9.2.x

Oh, and I forgot to mention that I've tried to reset the PRAM as well, it still just shuts down.

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"...hooked up everything correctly..."
"...he stuck a PCI-E 6 pin cord into the remaining 8 pin cpu atx female port..."
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I think you read into my post a little too much.
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freyburgerd wrote:
Folks,
On one of my Solaris 10 x86 servers at the last reboot it failed to come up. I put back the versions of /etc/vfstab and /etc/system from before the boot drive was mirrored. Exactly how you did that may matter.
"metastat" still reports the md versions of the slices are still in sync but I'm not convinced that's accurate since the failed reboot.You're absolutely correct. As soon as you write (or mount read/write) to one of the raw slices or to one of the sides of the mirror, the mirror will be out of sync, and SVM will not realize it.
How do I go back to mirrored again at the next boot?Detach the side you're not booted from. Redo the metaroot and come up on the (now one-way) mirror. Once booted from the mirror, reattach the other side.
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Loop for each mounted slice - Use metadetach to remove the one not mounted. Use metaattach to add it back. Use metasync to confirm the mirror synced up again.You'll want to detach before using the mirror again, but you can't attach until you stop using the raw slice. So you can't just detach/attach in one step. You'll need to reboot between them.
Once that loop has completed assume that any MBR stuff is broken. A bit like I've done with "mkboot" on SPARC but following the steps in the doc. Look at menu.lst, fdisk, installgrub, metaroot, have with and without mirror copies of /etc/vfstab and /etc/system ready just in case, reboot.
Not sure why any MBR stuff would have been affected unless you did so explicitly.
Basically all of the steps from the doc only instead of using metainit use metadetach, metaattach, metasync.
Does this make sense? It parallels stuff I've done on SPARC but I have a lot more experience on SPARC than on X86.Should be the same on both. If you're adding a new disk, you need to make sure boot support is added. But in this case I doubt any of the boot support was damaged (depending on the details of what led up to your changes).
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Why does my iMac shut down before it can boot up After installing 7.3 update on my iMac?

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Why do you need something extra for your migration? (Or is the reason your old PowerPC G5 needs to run Lion but it can't?).
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I did exactly this with my old PowerPC G5, using this enclosure, a Macally G-S350SUA, info at: http://www.macally.com/en/product/ipod4show.asp?ArticleID=215
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I then wait 5 long seconds before pressing the power on button again to turn the computer back on.
Having to plug in and unplug and plug in and having to wait ten minutes for it to work is not normal.
Is there a power supply issue in your home, perhaps?
Considering the value of this machine and the fact that it may still be under warrenty, I'd consider the weeklong diagnostic. Would the machine have the same need to wait ten minutes to turn on at the Apple place?
What if you plug it in at a friend's house, or an office or library? Would it still take ten minutes before you could turn the machine on?
It might seem horrible to have to wait a week...or to do this again and again but I'd recommend taking full advantage of your warrenty, keep sticking this problem back to Apple and insist it gets made right. It will be worth it in the long run.

Why is my imac shutting down by itself?

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Have you tried wiggling the AC power cord at both the wall socket (or surge protector bar)? You may possibly have a bad socket. Is anything else also plugged into the same surge protector preferably something that would stay off if its AC was interrupted. A light would not do since it could just barely flicker while that interruption would shut off the computer.
You may want to try it on a differnet AC power circuit. This would be a different breaker (or fuse) circuit from the one you are normally on. Is the AC outlet or circuit running on a ground fault interruptor protected circuit and if so, does the GFI trip? Coul;d it be reset by someone else if it is not right at your desk area?
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Why is this iMac shutting back down 10 seconds after boot?

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