Memory works in either slot, but not both at same time?

Hi, I've recently purchased some ram to upgrade my girlfriend's powerbook G4 15" 1.3ghz, 2x1gb chips. Before I installed it, I noticed the mac was only reporting 512meg of ram when we thought there was 1gb. Sure enough, there were actually 2x512 in there, but only 1 chip was being recognized. So, I tried the new ram anyway, to find of course that it would only recognize 1 of the 1gb chips also. In searching, of course, I've found all sorts of info on the lower slots going bad, but I've found in testing that any of the 4 chips (2 512mb and 2 1gb) will work in either slot, just not 2 chips at a time. So, both the upper & lower slots will actually function.
When I run the hardware test on the restore cd (sorry, I'm probably using the wrong name for this. I don't have it in front of me, and I generally.. gasp.. use PC's) I get this error:
post/0/2048 SODIMM0/J25LOWER
Now, she did upgrade to leopard maybe 6 months ago, but other than that, no major changes.
So, my questions would be, is this the same as the lower slot failure that everyone is having? Or is this something different? And, of course, is there anything I can do or try to fix it?
Oh, ya, and, this machine is well out of it's warranty, so hopefully no expensive repairs are needed?

Hi, beardo. My guess, and that's all it is, is that you have the beginnings of a classic lower RAM slot failure. I suspect, and it's only a suspicion, that lower RAM slot failures are caused by cracked solder joints, which in turn are caused by repetitive heat-related expansion and contraction of components on the logic board including the RAM sockets. My hunch, and it's only a hunch (have I qualified this post enough yet?) is that your lower slot is coming unstuck from the logic board only to the extent, so far, that when the spring-loaded slot is stressed in the particular way that having RAM modules in both slots produces, a crucial lower-slot contact is broken and the RAM in it isn't seen. When the lower slot and/or the logic board is stressed a little differently, by having a module in only one slot, the contact isn't broken. I imagine that the tolerances involved are minute: probably thousandths of an inch. I won't be surprised if the problem worsens to the point that your lower slot is completely undetected, particularly if you keep stressing the hardware by inserting and removing RAM modules in both slots, trying to find the cause. And I have nothing at all to suggest except all this guesswork and this repair option. I wish I could offer something more promising and helpful.

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