I assume you checked that the PC speaker is plugged in and checked for POST error codes. Check the mother board/BIOS docs for possible causes of reasons the BIOS never makes it to the POST tests. Most likely it is a CPU/motherboard problem. I think even missing memory will cause POST errors. My dad had that problem with an off-brand mobo and we tried everything but couldn't figure it out and had to return it for a different brand, which worked great on first startup. A final thought is to check the fan is connected to the correct connector. Many motherboards require the CPU fan to be connected to a certain fan connector (for fan speed/failure detection) and will not boot up without detecting a spinning fan.
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