G4 System hangs when adding 2x512MB RAM. Boots with one.

Here is a summary of the system:

OS:  9.04
G4 with AGP Display Adapter

This system used to have 128M of RAM.  I bought 2x512MB SDR PC133 RAM from 4allmemory.com --> They've been very patient in replacing the memory twice for us already.
When you have both 512M sticks in the system, it boots up fine the first time, you can check and the system shows 1G of RAM, but when you shut down the system and boot up, it hangs half way as it's loading the icons at the bottom of screen, don't ask which icon, please.
It works fine with 1 memory stick in it, 512MB.
I've tried all the different memory slots.  The problem is very consistent in the way I described it happening.  It boots up fine the first time with 1G of Ram, but if you shut down and boot up, it hangs half way on loading the icons.  
antoine777Asked:
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weedCommented:
First off, there is no reason to be running 9.0 on a G4. Take full advantage of the machine and update to OS X. At the VERY least get it up to 9.2.2. Second, those machines are very picky about ram. If the timing is wrong itll give you WEIRD behavior. Make ABSOLUTELY sure it's the right ram for the machine.
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antoine777Author Commented:
I checked with 4allmemory.com about the compatibility.  They're asolutely sure it's the right ram.  They've sold hundreds in the last year for G4 machines and this is the first reported problem.  Is the update to 9.2.2 free?  OS X sounds good, but it's difficult to convince the user to update.  They really only use it for browsing the Internet, accessing file server, and viewing images for marketing.  
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weedCommented:
Yes, getting to 9.2.2 is free. OS X is SOOOOO worth the update. Once they do it theyll wonder why they slogged around with 9.2.2 for so long.
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weedCommented:
As for the ram, were you grounded when you installed it?
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antoine777Author Commented:
Yes.  It was done in a safe lab enviroment, and this is the third set, same exact problem.  
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weedCommented:
Hmmm...My next best guess is that perhaps one of the ram slots is bad. Youve tried a verified good chip in all the slots?
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antoine777Author Commented:
I've tried all the 4 different slots, I even put them apart, slots 1 and 4 instead of 1 and 2.  
Same problem.  It boots the first time and works fine.  You shut down, boot up, and it hangs.
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weedCommented:
Try each slot with ONE chip.
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antoine777Author Commented:
It works with one chip.  That's what I have in there now.  The problem only occurs when you have 2 chips in it.  Works now with 512MB
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weedCommented:
One chip in which slots? Any of them? What is the chip that's in there now? Are they the same?
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antoine777Author Commented:
The chips are exactly the same.  Tried all the different combos, tried different slots.  It's working fine with one chip.  
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weedCommented:
Well, then theyre not all the same. If all the slots are verified working, and all the chips are the same speed and meant for that machine, one of the chips is bogus.

As a last idea have you reset the PRAM after installing? Run apple's hardware diagnostic tools?
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antoine777Author Commented:
I haven't reset the PRAM.  How do you run it?
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weedCommented:
Command-option-p-r at startup until youve heard the 3rd chime.
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