Take the server to its minimum to post configuration, thats the minimum components to allow the R710
•System board •Risers •Processor (CPU1) with Heatsink •Power Supply •One stick of memory in dual in-line memory module (DIMM) slot A1 •Control Panel with cable
Try powering under that configuration and see if it still hangs. If so then power down, remove the power cables, hold the power button for 20 seconds to drain flea power. After that then locate the NVRam_CLR jumper, as seen below, move the jumper over and power the server to clear the NVRam. After that then power down and restore the jumper to its original location, then power up and see if it still hangs.