Memory Juggle - Not all chips are recognized.

I have a MacPro. It is the base model 2.8 quad core with two 1GB 800Mhz chips in it.
I added four 2GB chips to the machine (3rd party)
Of course what i am doing/describing is paired per both pull-out memory cards.
I moved the Apple 1GB chips to the 3rd slot and put the two 2GB chips in slot one and two.
When doing this, the apple chips in slot 3 are not recognized.
i moved the apple chips back to slot one and the 2GB chips to slot 2 and 3. After doing this, the chips in slot 2 are not recognized.
no matter what configuration i try, i am not getting the full 10GB and not all my chips are recognized.
each time i reconfigure the chips, a different one is unrecognizable so it isn't like any one specific chip is bad.
any idea why and how to solve this?

As mentioned above, you must install the memory in pairs in each slot. You can't have a stick in slot 3 without a stick in slot 4, for example.
Put your 2GB sticks in slots 1&2 of each riser. Then put your 2 1GB sticks in slots 3&4 of riser A.
If memory is still not recognized, reseat it, as mentioned above. You could also try restarting and resetting the PRAM; do this by holding down command/option/p/r while restarting, and hold them down until you hear 2 or 3 startup chimes.

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