You will have to get a power board for 5810 with cables and remove your power supply and connect to it. Then you need a front panel power button cable etc.  What you propose will not work and its not supported.  5810 does not use standard connectors. As I recall it wont power on if the chassis intrusion switch isn't connected. [IMAGE]power board with cables  
Hi I have got two 0K240Y boards with CPU and would like to test this board without disassembling my T5810 Workstation. Is it possible to use a normal PSU (coolmaster v550 gold) for testing? Is  NVIDIA Quadro NVS 295 compatible to T5810? Thanks
T5810 Board Testing with non dell PSU