Intel iMac Core Duo will not accept OS 10.4.8 update

In a rash moment I once more decided to respond to Software Update's continual reminder that I have not updated to OS 10.4.8. I tried twice before and each time resulted in disaster with what I have been told is a kernel panic. During boot-up the screens wipes to grey with a black square saying 'RESTART'.
Then follows days of scouring backups to get everything back again. Well it just did it again. Why will it not accept the (Combo or Delta) update. Some have pointed fingers at RAM but why should the RAM work fine for more than a year and suddenly not for OS 10.4.8 and then work fine again once it has all been retreated to OS 10.4.7 ?

This is all just too weird !
The Apple Hardware Test CD would not run. I tried twice. It got as far as the 'probe' and didn't get any further.
Swapped out the 2 x 1Gb RAM cards for the original (piddling) 2 x 256Mb and tried the AHT again. It ran and found no problems.
AHA ! So it was the memory all along.
Put the 2 x 1Gb cards back in and ran AHT. It ran and found no problems
Okay, let's try the new 10.4.9 update via Software Update.
SAME THING AS BEFORE. Grey screen with the little black one saying restart.
Okay I'll put the 2 x 256Mb cards in and see if it manages to start. Before doing so I gave it one more try and after a self-induced restart halfway through boot-up it started - with the 2 x 1Gb memory.
Went back to Software Update and found a Java update and Airport. Ran them and when it restarted we were back to the Grey 'panic screen'. Tried once more - same thing. Swapped memory for the 2 x 256 and the iMac started. Tried a restart just to make sure. Back to the panic screen.!
removed and replaced the 2 x 256Mb and it started up. Restarted - Panic Screen.
Put in 2 x 1Gb - it started. Restarted - Panic Screen again. Replaced 2 x 256 - started. Restarted - Panic. Restarted - It fired up. Now I'm writing this whilst it is on because I cannot guarantee it will restart without swapping memory or reseating it or maybe just ******* into the wind.
Poxy **** thing can't make up its mind. There is no pattern.

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Mind if I try, Al?
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Log out and back in or restart.
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[email protected]

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Oly wrote:
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