Apple memory gone goofy

Hello

a few days ago my apple memory apparently went bad. My old config listed below

A1 - 1g original apple mem
A2 - 1g "
B1 - 1g Purchased apple mem
B2 - 1g "

Then out of nowhere, no update, nothing installed that I recall, "both" original apple memory modules were reporting only being 512Mb. Noticed by opening system profiler and caught that it was reporting 3 gigs of RAM. Completely threw me off. I did however install VMware fusion and specified it could use 1024 megs of RAM, after which is when I noticed it. Though, no telling when it could have happened.
I reset PVRAM, let it unplugged for a time, reseated the mem, all of which didn't solve it. I ran tech tool pro and it reported the same numbers in each Dimm position.

Yesterday I received 8 gigs of ram and installed that into my machine, repositioning the existing RAM... listed below

A1 - 2g New module
A2 - 2g "
A3 - 1g Original apple mem
A4 - 1g "
B1 - 2g New module
B2 - 2g "
B3 - 1g Purchased apple mem
B4 - 1g "

Opened up system prof. only to see that the mods. in A3 - A4 were STILL reporting 512mb as their RAM. Ran tech tool again with same results. All other memory is working properly and reporting proper numbers. But not the two. Status says their OK, but those are not the right numbers. It's as it both modules lost 1/2 of their functionality.

Any help before I drive 3 hours to the nearest apple store?

Ron