Dear Community, we have problems with the motherboard S5500bc with Kingston Memory - KVR1066D3Q8R7S/4GI and KVR1066D3Q8R7S/4G - 4GB PC3 8500 Parity. In both cases, the motherboard beeps 3 times (long beep) immediately after powering on. The CPU is a XEON 5640. The Post Code Diagnostic LED Decoder says oooX oXXX - that means: No usable memory error: No memory in the system, or SPD bad so no memory could be detected. Thanks for your help, bernhard
In addition to Doc's suggestion in http://communities.intel.com/message/101937#101937 , have you also tried with just one processor, and just one DIMM? Maybe the +12V rail isn't getting enough power, for some reason.