Apple Hardware Test : mother board problem : post/16/64

I'm having this problem since last month. My computer won't boot properly, aligning lines and lines on the screen saying there's a problem with cpu 1 or cpu 0. I reset all Xram I could find, reset the PMU, changed the battery...
Finally, I used Apple Hardware Test that gave me this message : post/16/64 on mother board at startup. Then, when I run the tests, everything's OK !
I manage to boot from time to time with 10.4.7 only, other installed systems won't do it.
Would anybody have a clue about this ?
Thanks for reading me.
My computer is 4 years old, it worked well until then, I want it back, fully fitted.
I have screen shots that I can share if needed.
BTW : the sun is shing here in Paris, France at the moment, which soothes my heart a little...
G4 QuickSilver bipro 1Ghz Ram 1Go Mac OS X (10.4.7) + Mac Os 9.2.2 + Mac OsX 10.2.x

Hi,
I have some good news for you all : I finally decided to open my machine and see what's inside...
I took a small paint brush, a screwdriver, a pressurized air bomb (hope you call it this way) and cleaned all the inside. I had some parts taken off, even the big thing that gets heat from the processors. My brother, who knows more than I do about the subject even advised me to unplug the processors, supposedly connected on a ZIF card (Zero Insertion Force card). I didn't manage to make them move at all. I took memory bars away, the video card too, to make place for the screwdriver to unlock the (radiator ?). Then I brushed all the dirt away, there was plenty, and put everything back inside.
It works fine, it really does. So, I guess and hope this will last for an other 4 years.
Thanks for the help.
Jacques.
G4 QuickSilver bipro 1Ghz Ram 1Go Mac OS X (10.4.7) + Mac Os 9.2.2 + Mac OsX 10.2.x

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Apple Hardware Test : mother board problem : post/16/64

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