Does this sound like a bad logic board?

Howdy everyone,
Tried searching and troubleshooting but I'm at a lost for answers so maybe someone who has experienced the same thing could chime in.
Our 2009 MBP started experiencing random beach balls a couple months back that gradually developed into full-blown lockups. Eventually the system refused to boot up so I figured it might be a hard drive problem.
I tested and verified the hard drive by:
1) using disk Disk Utility to verify and repair the drive (completed without any issues and S.M.A.R.T. is 'verified')
2) by installing the hard drive internally on a 2008 MB to see if it worked (booted up and worked just fine)
3) hooking up the drive to the MBP via USB enclosure and booting up as an external disk (again also worked fine)
Next I figured it would be the hard drive ribbon cable so I ordered and tried two different ribbon cables, one from an Amazon reseller and one from iFixit. I get the same result with both cables. The drive is recognized in Disk Utility but the system refuses to boot and gets stuck at the logo page with the spinning progress indicator. Booting in verbose mode revealed nonstop disk0s2 i/o errors.
I've ruled out the hard drive and the ribbon cable at this point so is there anything else that could be the culprit or does it sound like the logic board?
Thanks in advance for any input you could provide.

Hi Neurotic
You maybe in luck, that 24" with the NVIDIA GeForce 7300 GT is rare and unlike most other iMac's can be refitted and with a new graphic's chip. Unfortunately the iMac is very difficult to open and work on, plus you may need an Authorized Apple Service Provider to locate and order the proper graphic's chip.
For a service provider in the US see > http://www.apple.com/buy/locator/service/
For service provider elsewhere see > http://www.apple.com/uk/buy/locator/
Dennis

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Message was edited by: Mechanic man
Message was edited by: Mechanic man

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Computer specs:
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Back in October of 2008 my iMac G5 Power PC shutdown intermittently and then when I went to go to start it back up, it booted to the blue screen and hanged there forever. So, I did a hard shutdown and then waited and then booted again and it still hanged at the blue screen. I tried booting in Safe Mode, and that worked, so I had a chance to backup everything that I needed to. Then, I took the computer to my local Apple Store to speak to a "genius". They could not diagnose my computer while I was there, so they needed to take it overnight and let me know over the phone what the issue was. The next day they called to tell me that it was a Logic Board issue and that it would cost $900 to fix it. I obviously was blown away at the cost for the problem, and I could not afford that charge so I seeked out other options. I found a shop in my neighborhood that offered me a used 1.8 ghz logic board for half of what Apple was quoting me, so I went with it. Then, 9 months later (which brings us to present) my iMac completely shutdown on its own and would not start up. I ran it through some tests (LED lights on the interior) and confirmed that it was a Logic Board issue again. So, I took it back to the shop in my neighborhood and they told me that the warranty for the part they replaced had expired. So, I called Apple Customer Relations to talk to them about the issue. They confirmed, using my serial number, that I could get my issues fixed for free. They then told me about the "iMac G5 Repair Extension Program for Power Supply Issues" which was news to me. This Program ended in December of 08, meaning I would have qualified in October of 08... the time I initially brought in my computer. So, I brought my computer to the Apple Store to drop it off for repairs, and when going over the history of the machine they confirmed that because there was a used 1.8 ghz part in my machine installed from a non-authorized Apple place that they COULD NOT fix my issues now.
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Back in October of 2008 when I brought in my computer to the Apple Store and they diagnosed it with a bad Logic Board, could that have been because of a bad power supply? If that was the case, does a bad power supply cause a Logic Board to go bad?

Welcome to Apple Discussions.
The short answer is no, but it's actually more complicated than that. The original iMac G5 17 and 20 inch models were plagued by two problems: defective capacitors which affected the logic board, and an unrelated set of defective capacitors which affected the power supply. Rarely were both conditions present at the same time, but Apple decided—when they issued the repair extension authorization—that replacement of both components was a more cost effective approach. By far, the most common of the two problems involved the logic boards.
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