Get help from this electronics repair book that is useful for repairing any power supply problems and also television repair guide.
Make sure that all the power cables required are connected properly to the motherboard, test the powersupply on another motherboard for example or use a powersupply tester.
Check that the power switch is connected on the right pins on the motherboard and that the switch works.
The motherboard should turn on - spin fans even if there is no memory, cpu or video card installed. So something is not connected properly, or either the powersupply or the motherboard is faulty.
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