Boot problem, RAM error but RAM fine, help!

I've been having trouble booting for some time now.
At first I didn't get any response when I pressed the power button (black screen, no chime). The force restart <ctrl,apple,power> would get it going after a few tries but unreliable and it could go for weeks without a successful boot. Now I can hardly boot and get a RAM error (4 beeps) at the startup, more frequently now.
It won't boot from an external firewire drive or installation CD.
Tried the following;
Disk repair, when I eventually got it to boot on CD after many attempts said everything was fine.
Everything was fine on the hardware check.
Changed the RAM, twice!
Tried this ribbon cable insulating thing I found on another thread, it booted up straight away and then not again for ages. Probably just a coincidence.
Reset PRAM, PMU etc.
Paid a service place €50 to tell me what I knew and that it's probably the logic board, €800 odd to replace... no thank you.
It works perfectly when it's up and running. I did get the odd crash when waking from sleep.
So my choices are, now that I've booted it again after a few weeks of attempts;
1. Leave it on indefinitely as a desk top, don't sleep and don't install anything requiring restart, like Quicktime so I can't see iTunes videos.
2. Start saving!
3. Be saved by some genius out there...?

Have you tried isolating which RAM slot may be at fault. If the RAM has been changed and the problem is intermittent it could be a loose connection between the RAM holder and logic board.Actually 4 beeps isn't a RAM error but rather a ROM error. This would point towards a new logic board being required ££££. You could take a risk on ebay. There's plenty of Ti owners who smashed displays or broken hinges who break their Powerbooks up to sell in parts on ebay.
mrtotes

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