What is happening is that the second DRAM SIMM sometimes isn't detected or isn't working correctly. Whenever this happens the Rom Monitor of the 3640 will generate this error message (either on power-up or during reload):
ERROR: Illegal system memory (DRAM) configuration.
The current system memory configuration is:
SIMM 0 SIMM 1 SIMM 2 SIMM 3
Possibly the SIMM itself is bad or there could be a problem with the Mainboard of the 3640. Before RMAing this again, please
remove each of the DRAM SIMMs from their
sockets and then replace them carefully.
Check whether the DRAM's seated in bank's properly or not.
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