24 Pin Power Supply Problem with 6507

Have fitted new (quiet) PSU Akasa P400FG to a Mobo MSI 6507 and it does not work. The PSU has 24 pins so used 24 to 20 pin adaptor. Noted that nothing was going to pin 18 (-5v) on the Mobo, but understand this is normal as not used on more modern boards.
Monitor blank/all fans running/CD & HDD nothing/Power on and HDD lights on case continually illuminated.
Refitted original JeanTech 300w PSU and all worked. Got a replacement unit from Akasa and situation unchanged.
What could be wrong.
Processor P4 2GHz
Ram 128Mb
Graphics Radeon 9800PRO
40Gb HDD
Please help as have nothing else to try.
Paul

What about the 4-pin connector that goes to the MOBO as well. You have 2 connectors to go to the MOBO, the 20 pin and a 4 pin. The 4 pin connector is square and, on my MOBO, the connector goes to JPW1 on the board. This is what provides power to the CPU.

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