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Regarding power LED not glowing in EVAL-SDP-CB1Z

I am using EVAL-SDP-CB1Z board in conjunction with EVAL-AD5770RSDZ Initially I installed the required software to program AD5770R in my PC and then connected the SDP-B with AD5770R. Then connected SDP-B to my PC via USB cable. I did not powered AD5770R board. My PC was detecting both the board and I could program the registers from software. But after some time suddenly the green power LED on SDP-B board went off and the software also couldn't detect the board. I don't know why this happened. After that I tried connecting only SDP-B board to my PC but still the power Led was not glowing. Is it because of some short circuit somewhere or some component damage? Please provide required assistance. Thanks in advance