Memory On Duel 2 gig G5 Disappearing.

My Mac crashed yesterday 2/11/09. I noticed after I rebooted that the memory was showing 4.6 gig instead of 6 gig. I added 4 more gig last August. It has never had any other problems before this.
I looked at Diagnostics:
Power On Self-Test:
Last Run: 2/11/09 7:33 AM
Result: Failed
Failure type: Memory
Memory slots: DIMM0/J11, DIMM1/J12, DIMM4/J41, DIMM5/J42
I should have 4 512k dimms in slots 1 & 2. I should have 4 1 gig dimms in slots 3 & 4. I swapped dimms around finally concluding 1 set of 1 gig dimms was the problem. I removed them and everything seemed to work running with 4 gigs. Then the same thing happened again with the same Diagnostic error as above. So I put all the dimms back in and booted with the hardware test disk. It sees all the dimms properly. I ran the test (2 hours & 30 minutes). It ran fine. I put the computer to sleep & in the morning ran the long test again no errors and 6 gig of ram showing.
Any ideas what is or was wrong?

OK - I started to have similar problem:
0) Dual 2.5ghz PowerPC G5 (late 2004)/4 gigabyte (512megs*2, 512megs*2, 1gig*2) w/OSX 10.4.11
1) The very first cold boot always kernel panicks within 3 minutes.
2) Force-rebooting allows me to run the computer for a while, but putting it to sleep crashes the OS (w/KP)
It ran just fine for 3 years or so ... then all of the sudden i'm faced with this weirdness
So I checked the System Profiler... under "Diagnostics" it shows the Power-on selftest result:
Last Run: 4/17/09 10:14 AM
Result: Failed
Failure type: Memory
Memory slots: DIMM0/J11, DIMM1/J12
And I booted the machine w/ Apple Hardware Test disk, and it tells me DIMM1/J12 is bad.
I tried swapping around memories (while keeping in mind they work in pair of course) and thet DIMM1/J12 still shows as defective! ....
Funny thing is that the "defected" DIMM sometimes gets recognised. The machine sometimes tells me the first pair is 512meg*2, while other times it shows it's a pair of 250meg DIMMs ... Once in a blue moon it shows the first slot pair is "EMPTY" ... like right now.
Of course I zapped NVRAM and PRAM several times but the issue remains... I know it's a hardware issue because the machine crashes even while running in the blackscreen singleuser mode. Very unreliable.
Could someone tell me the cause(s) of this weirdness? Thank you in advance!

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