a1 and a2 ram slots not working - Which slots are proper to install 2x8GB of RAM? asia 888 slot

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Due to Intel Lynnfield CPU integrated memory controller limitation, DIMM slots A1 AND B1 must be populated first, or your system may not boot up, since the memory modules in A2 and B2 will not be recognized.

poweredge-r620 | Dell PowerEdge R620 Owner's Manual | system-memory ... channel 0: slots A1, A5, and A9 channel 1: slots A2, A6, and A10 channel 2: slots A3, ...

Seems like mobo is problem I have tried with single ram, in all slots only slots a1, and a2 working slots b2,b1 not working.