Mac G5 Won't boot. Won't boot from reinstall disc, doesn't recognize hard drives.

Hello everyone,
I have a problem with my 2005 G5 and I've tried desperately to fix it over the past couple days.
It started with my G5 oddly booting up to OSX Leopard and missing numerous key features such as the dock, the abillity to restart/shut down from the menu, and I was also unable to drag icons around on the desktop. Though, weirdly enough, some programs would still launch.
My goal this week was to reinstall the OS to see if it would fix the problem. I tried numerous times to reinstall from boot via CD while holding C at startup. Also tried reinstall from an external harddrive, and USB, to no avail. I hold down option, and it doesn't detect the internal hard drive. I put in a new 500GB hard drive, still doesn't detect it, nor does it detect the install disc, USB, or external HD.
Since putting in a new harddrive, sometimes the computer will not go past a black screen, but occasionally sometimes will get a grey screen. Fans start spinning like crazy at this point.
So to recap, thus far: I removed the old hard drive and put in a new one, switched around ram, reset PRAM, took out and put back in the video card, tried to reinstall from CD. Still the same results, unable to boot past a grey or black screen, and unable to re-install the OS.
My only conclusion is that it could be a bad logic board.
Does anyone have any insight on this, or agree with my hypothesis? If so, I'll likely pick up a new one off ebay and have a go at installing it.

Is the External drive USB or Firewire? G5s won't see/boot USB drives as a rule?
Do you have another Mac around with Firewire?
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 startup problems...
See which one your G5 has...
http://eshop.macsales.com/item/Newer%20Technology/CR2032/
http://eshop.macsales.com/item/Newer%20Technology/BAA36VPRAM/
Have you done a PRAM reset, CMD+Option+p+r...
http://docs.info.apple.com/article.html?artnum=2238
Does it boot into Open Firmware with CMD+Option+o+f ?
http://docs.info.apple.com/article.html?artnum=42642
reset-nvram (press Enter)
set-defaults (press Enter)
reset-all (press Enter)

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Restoring your entire system from a backup
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Note: If "You can't restore this backup because it was created by a different model of Mac" appears when restoring a backup that was made on a different Mac, follow the onscreen instructions.
I even posted this information on the community and apple removed it... because they don't like the:
Off-topic or non-technical posts
Non-constructive rants or complaints
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Hello,
I recently purchased a new hard drive to replace the original that came with my Mac Pro 2008. I was able to format the new drive using Disk Utility. I am now at the point where I need to install OS X onto the new drive, but the computer refuses to boot from the disc. The disc is recognized by the computer (I can access the disc and am able to use the BootCamp applications, etc.) but I just get a black screen when trying to boot directly from the disc. The computer boots fine otherwise.
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Clone should be a must and easy to do and learn (learn by doing! 2)
6800 would 'qualify' as 5x70 series flashed etc and same rule: 10.6.5
In the past there was 10.4.6, 10.5.6, but not 10.6.6 - even though strong need for such a DVD.
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Clone
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Using Cloning as a Backup Strategy
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
http://www.bombich.com/software/updates/ccc-3.5.html
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http://macperformanceguide.com/Mac-HowToClone-backup.html
http://macperformanceguide.com/Mac-HowToClone.html
http://www.macupdate.com/app/mac/7032/carbon-copy-cloner
http://www.macperformanceguide.com/blog/2012/20120711_2-MacPro-internal-clone-ba ckup.html
The DVD is dependent on your hardware. And your hardware changed. The drivers for the 5780 and 6xxx are bundled in the OS and lacking. Minimum build thing.
Put the new drive anywhere you want. Does not matter. Can move it later. Can be drive bay 0-3 or a Firewire external or under the DVD drive.
When you clone pull the old drive and boot from the newly cloned.
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My MacBook pro won't recognize hard drive I put in it. It boots only to a white screen unless I boot to my recovery USB. If I do that then I can select my USB and my external time machine drive in the disk utility, so no problems there. But what do you think it is? It won't recognize any hard drive I put in the machine, so might it be the sata cable?

Boot the Recvoery USB, use Disk Utility to select the internal drive makers namea and size on the left.
Now select erase and select the midde option and click erase, it will take a bit to complete but it's best for the drive.
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Quit and you should be able to install OS X now with your Apple ID and password.
see
http://osxdaily.com/2011/08/08/lion-recovery-disk-assistant-tool-makes-external- lion-boot-recovery-drives/

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Hi:
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G4 Won't start. Won't boot from any disc (OS 9 or Linux).

I recently acquired a Power Mac G4 from my school, as they did not need it. The computer was a donation to the school, so the hard drive was removed and destroyed.
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The Mirrored Drive Doors G4 models (and possibly the quicksilver 2002 models) are unable to boot OS 9 from ANY "Full Retail" CD. These Macs came out after the last versions of "Full Retail" 9.2.1 were issued, and if you bought one of these advanced G4s new, it came with a set of discs that contained a customized 9.2.1, so no new "Full Retail" OS 9 CDs were needed.
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Message was edited by: Grant Bennet-Alder

2007 iMac won't boot from startup disc

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Sorry for your loss ...
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If your sure you have the correct Install Disk for that iMac, I'd start over. Then if it still doesn't work then perhaps a trip to your Local Apple Service Provider with the Disk or Disk and iMac is in order.
http://www.apple.com/buy/locator/service/
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Mac G5 Won't boot. Won't boot from reinstall disc, doesn't recognize hard drives.

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