IMac can't log-in after regular e-update

This is a follow up for my old post.
My iMac-G4(flat panel) can not log-in after the
on-line free software e-update provided by Apple
weekly. The actual diagnosis is: start up the iMac,
when the blue-bar finishes, no log-in box showing up,
so I can't log-in to use. I have tried to re-install,
but it could not re-install. But I ran the Hardware
Test CD, it said OK. I took the iMac to Apple's Hong
Kong support center, they charged me HK$600(US$80)
for examination fee, then said it was the logic-board
problem and needed to replace for another
HK$6000(US$800) cost. I ended up not to fix it as too
expensive. Anyone have opinion? Because I thought if
the logic board died, how can I still able to start
up and run the Hardware Test CD?
imac G4 Mac OS X (10.2.x)
was upgraded to OS X 10.4.3
My iMac just crashed after the latest software update - (iMac 20" Intel Core Duo, 2GB RAM, 256MB-VRAM)
After the latest software update, the screen went grey and black boxes appeared with messages about a "panic". Needed to use power button to restart but I received the same message ("panic" and need to use power button).
AppleCare didn't solve it - They had me "Repair Disk" (it was OK, no repair needed) then they had me try a "Archive Install" but that didn't finish (after about 40 min. it locked-up with only 2 min. to go!). I tried this 3 times with the same problem during the last 2 min. (it was installing iWeb files...)
I have Apple Care but since they couldn't help, I plan to take it to the Apple Store today.
I can't believe your logic board is bad either...
Anyone else having a problem with the latest updates??

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Originally Posted by pszewczuk
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