Added new RAM - now old RAM not recognised

I've seen several posts where people have had problems with new ram not being recognised, but my problem is this: Following advice from http://manuals.info.apple.com/en/MacProMemoryDIMMDIY.pdf and http://homepage.mac.com/tribe3/.Pictures/MemConfig.jpg, I added 2x1GB Crucial ram to my MacPro today. I put the new sticks on the top riser where the factory-fitted 2x512MB sticks were, and put the 512's in corresponding slots on bottom riser. Now System Profiler shows this:
DIMM Riser A/DIMM 1:
Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: OK
DIMM Riser A/DIMM 2:
Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 667 MHz
Status: OK
DIMM Riser A/DIMM 3 & DIMM4:
Size: Empty
Type: Empty
Speed: Empty
Status: Empty
DIMM Riser B/DIMM 1, DIMM 2, DIMM3 & DIMM4:
Size: Empty
Type: Empty
Speed: Empty
Status: Empty
Not sure how to proceed with this, and I don't enjoy the "thrill" of opening up the Mac so I'd welcome suggestions at this point. In particular, is it a good idea to zap the PRAM at this point? Is there any way of checking if Riser B is defective?
Thanks in anticipation
Jim

OK- I think I'll just go with it as it is for now. I'll have a chance at the weekend to hammer it with Photoshop and see how it copes. I ran Lightroom this afternoon, and it really was much faster than previous to the upgrade. I'll time its performance in PS with a Photomerge of 24-shots @ 10.1 megapixels each. If it copes with that, and I get the sort of performance boost I'd expect, I'll leave Memtest for now.
BTW - your statements "Memtest is a better choice" and " AHT is good for finding hardware compatibility issues and sometimes finds things (in 30 minutes) that no amount of Memtest would" seem to contradict. Or am I misunderstanding?
Thanks again for your help
Jim

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