Early Mac Pro does not recognise ram in Riser A

System information shows that I have only 8Gb of ram installed when it should show 14Gb, there appears to be no ram installed on Riser A even though I have 6 GB of ram on the card. Assuming that the issue was the card on which the ram was installed I swopped the card from Riser B which has the 8Gb on and put it in Riser A and the 6Gb in Riser B. System Information now shows that only 6Gb is installed so I think it can be assumed that the cards and the ram chips are OK. So is this a hardware or software issue?
I recently had to replace the Grphics Card as the old one died could this have resulted in some damage to the motherboard.

What graphic card? you had 7300GT and put an ATI 5770 in and connected the power cable w/o trouble?
No, had some power issues, computer would randomly shut down to begin with but after a full SMC reset the ATI 5770 has been fine.
The top slot for a Riser then, even after replacing with a new one?
And where did you buy the new Riser?
Have not replaced either of the risers?
Ram is a mix of Crucial and Kingston and was all working prior to Graphics Card being replaced.
OK! So I have run a Hardware test which shows I have all 14Gb of Ram physically installed in the appropriate risers but only 8Gb is shown to be actually working. Thats the 8Gb installed on the card in Riser B. Can anyone explain that?

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Early Mac Pro does not recognise ram in Riser A

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