Part number 2XD3X · also known as PERC12
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Dell R660 PERC12 CTRL_DST_PB1 to MB_SL4 Cable -
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The LED codes on the R660 motherboard can signal various issues, such as a 5V switch fault or problems with connected USB devices, iDRAC cables, or the rear I/O card. To troubleshoot, perform a flea power drain, clear the NVRAM, and test with only the minimum components necessary for POST. If the server still does not boot, further inspection of the components may be required. [community thread]