HP Z400 Workstation Power Supply not Supported

Good Day All,
I would like to seek help on the issue that i am currently facing.
Currently, I am using an HP Z400 Workstation and decided to switch to a bigger casing. I Bought a Full tower and casing and just realized that i am unable to move the power supply (425 Watts) as well due to the cables are too short to reach the CPU main Powers.
So I bought a separate Power Supply (Cooler Master M2 Silent Pro 850 Watts).The cables are perfectly enough to reach the CPU main power source. After putting everything the pc won’t turn on……
I thought my newly power supply was defective and got a replacement at the same day. I tried the new Power supply and simply does not want to turn on… this is getting frustrating as I am unable to figure out what is really causing the issue.
I also tried to just plugging the cables at the Main power and removed all the additional devices just to test but still no luck….
I started checking forums… there is only one post regarding about unable to change any other third party Power Supply for this HP Z400 Workstation. I guess it apply to all HP Branded as well as Dell.
Guys I need your help as I don’t want to make a mistake again on considering to build another machine just because this one was not working… Maybe there is one there that manages to bypass or have a resolution on how I can successfully upgrade my Power supply using the same HP Motherboard.
Here is my Current Specs..
Processor
Intel® Xeon® Quad-Core Processor W3565 (3.20 GHz, 8 MB cache, 1066 MHz memory)
Chipset Intel® X58 Express
Here is the link for the full details of the specs
http://www8.hp.com/sg/en/products/workstations/product-detail.html?oid=3718668
Here is the power supply I want to replace http://h20464.www2.hp.com/results.htm?SID=3718668&MEID=368CA2BE-30F2-40AE-8929-DBF4AF2ADC21
Will wait for your kind reply,
Thanks

The reason it won't turn on is because pins 21 and 23 are not in the standard ATX PSU configuration. Your motherboard works with an HP configured ground on pin 21 and +12 VDC instead of the ATX (ATX12V v2.01)standard unused pin and +5VDC respectively.
Z400 PSU connector
Standard ATX PSU connector
I have not seen a non HP PSU available that would work without modification.
Not all HP's are built with propietary PSU connections most newer, non-business models use the standard ATX PSU configuration.
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

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