Random freezing. Logic board failure, or something I can replace?

I managed to get hold of a battered 12" 876 Powerbook. The screen was smashed, but I managed to replace it with one off ebay. All worked fine for a few minutes until it froze. I reformatted and the usual stuff but random freezes kept happening. Sometimes it would not start at all, othertimes halfway through the startup process, sometimes 3 hours later. It turned out to be when I moved the laptop so I assumed something was lose...
After having the whole thing apart(!) and putting it back together, twice, it still freezes when I move it!
I have worked out that if I put down pressure onto the trackpad corner of the DVD-R drive it will start perfectly until I release the pressure. It is not related to the cable for the DVD drive as it will start regardless of whether it is connected or not. I cant see a lose connection between the DC board and the logic board, and I cant see any obviously lose components.
Is there anything else it can be?! Its annoying the **** out of me as it must be something simple! If its definately a logic board problem then I may try and get one off ebay, depending on the cost. I just don't want to spend more money to have the same thing happen again!
Thanks in advance!

dombird:
Welcome to Apple Discussions.
It sounds like you might be having a logic board issue. There is a fix suggested in the G3 iBook Dual Forum, but I don't know if it will work on your computer. You will find it in this thread.
To test whether it is the logic board, boot from the Apple Hardware Test disk that came with your computer and run the tests. If nothing shows, run it again, or run it in a loop.
Sorry I can't be of more help.
Good luck.
cornelius
Message was edited by: cornelius

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I bought my MacBook pro in March 2008, 15 inch, and it is now out of apple care.
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whitdare4 wrote:
Did hardware test and got error code 4SNS/1/40000000: TC0D - 107.500
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I have been quoted over £400 for the repair! Like the above post I do not believe that this part should fail - and if it does then it is a major design problem and Apple should be doing something for us. I just dont know where to start.
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Hi, Christopher. Welcome to Apple Discussions.
Try booting into Safe Mode. This will take quite awhile longer than a normal startup because it does a file check and repair of the hard disk.
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Once you have repaired the hard drive with either Safe Mode or the Install disc's Disk Utility, then start up normally and repair permissions from Disk Utility in the Utilities folder on the hard drive.
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You might think about posting there, too, so others can read about your issue.

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Hi,
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... the boot failed while running diagnostics
Obviously it means nothing in the end, but it is commonly accepted that when a repair facility accepts an item for repair, the item remains in their care from that moment until you accept it from them, after which it is returned to your care. The fact it failed while in their care does not appear to be in dispute. You have no way of determining how that occurred, nor should it be your responsibility to determine it. They could have dunked it in water for all you know. How is that your responsibility?
How do you prove that in any case?
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So I offered to pay to he $200 that an extended warranty would have cost.
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There are a lot of threads discussing the logic board failures in MBP's. I have a brand new MBP with Retina 2012 that failed due to a bad logic board. Apple is replacing the machine, but is this a bigger problem others are having?
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There are a lot of threads discussing the logic board failures in MBP's. I have a brand new MBP with Retina 2012 that failed due to a bad logic board. Apple is replacing the machine, but is this a bigger problem others are having?
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Hi! Does anyone had problems regarding logic board failure on Macbooks Pro 13''?
I've bought mine 2 years ago and it started to fail. I took it to the technical support and was told that the logic board was damaged and it had to be changed. The warranty expired last november, so I have to pay for it. The problem is the logic board costs almost the price of a new macbook pro.
It is not possible that Apple think it is ok that a notebook that expensive lasts only two years.
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Hi! Does anyone had problems regarding logic board failure on Macbooks Pro 13''?
I don't have the problem, but it's been percolating on another discussion for several years now:
https://discussions.apple.com/thread/2675881?start=0&tstart=0
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Random freezing. Logic board failure, or something I can replace?

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