PowerMac DP G4 Won't Boot With All RAM Sticks Installed

A few weeks ago, my 800 MHz dual-processor G4 started having frequent kernel panics. I tried all sorts of things, including changing the PRAM battery, resetting the firmware, and resetting the PMU. Then, one day, it would only power up but not boot, so I took it in for repairs.
The shop I took it to determined that the logic board was malfunctioning and replaced it. The computer no longer has any kernel panics.
The machine was designed for three 500 MB RAM sticks, which is what it had ever since I bought it over five years ago. Now, apparently, it won't boot with the last one installed, though it will with two. The shop replaced the new logic board and and even swapped RAM, but the problem still persists. Neither the power supply nor the hard drive appear to be malfunctioning.
Does anyone have any ideas what's going on? Any ideas or advice would be greatly appreciated.
Thank you.
G4 800 MHz Dual Processor Mac OS X (10.4.9)

squeakmaster, welcome to Apple Discussions.
Have you tried the following with one 512MB RAM stick:
1. Palce it in the first RAM slot. Does the Mac boot?
2. If so, remove the stick & place it in the second RAM slot. Does it boot?
3. If so, remove the stick & place it in the third RAM slot. Does it boot?
The results of this test should reveal (1) if the stick boots in one or more RAM slots, the RAM is good and (2) if it fails to boot in a RAM slot, there is a problem with that slot.
Do this with each of the tree RAM sticks & post back the results.
When the logic board was replaced, was the firmware updated to be compliant with OS X. (Note - The firmware is installed on a chip on the logic board.) Check your Mac's firmware (Boot ROM version) version. Mac OS X: Available firmware updates
http://docs.info.apple.com/article.html?artnum=86117 If an update is required, the update must be installed (using OS 9) BEFORE you install OS X.
Can you boot up in OS 9.x? If so you can use DIMM First Aid - Check & recover disabled (missing) RAM from Apple's latest firmware updates http://www.versiontracker.com/dyn/moreinfo/macos/10415
 Cheers, Tom

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