I'm trying to put an AMD 64 4000+ CPU and Gigabyte GA-K8NXP-9 mainboard into an Antec Sonata II case (Containing an Antec Smartpower 2 PSU).
When I switch on the power, the CPU fan starts up but it keeps pulsing: going up to full speed then dropping back again. There are no beeps, but the speaker constantly emits ticking sounds about 2 times a second. The system doesn't boot at all.
To try to isolate the problem I've removed all peripherals and the graphics card.
I've used another PSU (450W Tagan) to run up the motherboard/processor without any problems.
I've also used the Antec PSU to run up an older AMD motherboard/processor.
I'm stuck. The only thing I can think of is that the PSU isn't powerful enough to run up the motherboard and processor I'm trying to use. But that seems surprising since I thought the Antec Truepower II was quite a high quality PSU.
Can anyone help me solve this problem?