Mac keeps shutting down

Hi,
this is a bit of an awkward problem – not sure if someone can help me out.
I work on a MacPro (early 2008) but have updated it with two hard drives (SSD) and 24 GB RAM. So it works pretty well.
The computer is connected to a battery back up because we have lot's of brown outs in my area. My computer battery got fried 2 years ago (after a black out) and I think I have a third party battery now in the machine.
Everything has been working fine these last two years but now my Mac keeps shutting down and tries to start up again without success. I tried to find the problem and tested a new external battery back up, which wasn't the problem. I check our electrical outlets. They seem to be OK, though the electrician found out that they weren't wired properly – so he fixed it. And it works fine for a week. During that week I unplugged the computer from the outlet so that the internal battery can drain. When I stopped doing that and left the cable in the machine over night, the problems came back and the Mac kept shutting down. So my guess was, that there is something wrong with the internal battery of the computer. The strange thing is that the Mac works fine when I plug it with an extension cord in an outlet downstairs. This is confusion since there might be really an electrical issue in our home (?)
Then two days ago I realized that my memory RAM shows up only 12 GB instead of 24 GB. So I took the RAM out, dusted everything and put the RAM back in. The Mac was back at 24 GB.
So far the Mac hasn't tried to shut down on it's own. The cable is plugged in in my office outlet; not the ones which worked fine downstairs but I unplug it over night; just in case. As you can see, there is a lot of confusion in finding the problem. Perhaps the shut downs were related to the RAM? I'm just concerned that the problems come back.
Has anyone a clue what the problem is/was. Has anyone experienced something like this before?
Thanks for you input.

I assume that you realize there are cheaper and now better FBDIMMs should you need to narrow down and find any that are offending?
Often heat and dust, and FBDIMMs run hot, age, go bad over course of time. New ones run cooler, that helps.
That you have now probably a 900W or higher, 1500VA UPS, and that you should not have to turn off, leave it on, shutdown or leave the Mac running, up to you.
Resetting the SMC and NVRAM probably done more than enough. USB devices are also able to cause erratic behavior. Been there and done that.
We also have a fair share of power oddities and UPS is a must - all my TVs and such have one, any electronics and floor lamps.
But you also want your modem, router, and important equipment on UPS too, and I found my old APC would interfere with modems and routers, my new-ish Cyberpower do not and work fine so I feel more protected (having had a modem problem is no fun, it was semi functional, semi not (illiterate) if you will (now have spare modem and router too). If you don't filter the RJ45 out of the modem, there can even be too much for the router or the RJ45 ports is what APC told me in a conversation years ago.
3,1 has been more prone to shutdown issues. So yes there are - some early versions of 10.8 for some, for others it was that they upgraded from 10.5 on and had never made a clean break esp. when Lion dropped support for older Rosetta dependent code.

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I believe -122 is a power issue...
Might be time to replace the PRAM Battery, 4 years is close to their lifespan, far less if ever without AC power, & can cause strange problems...
See which one your G5 has...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
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ivanguy35 wrote:
I have reviewed all the topics here and nothing quite matches my problem.
When I put my computer to sleep, after about 30 minutes, it shuts down.
I have vacuumed the vents.
I checked Console for warnings (there are none).
I reset the SMU.
I reset the PRAM.
It is out of its warranty with Apple Care ... is my computer dying??
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Shut down the computer.
Disconnect the MagSafe power adapter from the computer, if it's connected.
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Press and hold the power button for 5 seconds.
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When switching on my Mac Pro on bootup it keep shutting down then eventually it works fine

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I have downloaded photoshop elements 12 on mac. But the program keeps shutting down and i have to restart it the whole time.

I have tried deleting the program and reinstalling it but it is not working. It is really annoying since I use it for my photography business. I can not work in a program that keeps shutting down.

You must always, always use the uninstaller in the PSE 12 folder in applications. Unfortunately, you broke some stuff by moving the program that way, so now I'm afraid you have a bit more work to do. First, download and run this:
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