I do not see anything in the manual about LEDs for D1-D4
Super Micro Computer Inc Products Motherboards Xeon Boards X5DP8 G2 .
However if the motherboard is not posting it could be the RAM. One continuous long beep means that there is no memory detected (D1-D4 may refer to the dimm slots 1-4). You can try booting off of a single stick of RAM, and try different dimm slots to get the motherboard to post.
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