The SOYO board does not support anything higher then 533 front side bus.
If your p4 2.4ghz processor is 800 mhz front side bus it will not work in that motherboard.
Judging by the fact that when you tried puting the 2.4ghz processor in the Soyo board and it would not POST I'm betting it is not compatible.
well youll notice if you follow this link http://ark.intel.com/products/27438/Intel-Pentium-4-Processor-2_40-GHz-512K-Cache-533-MHz-FSB
that the P4 2.4GHZ is 533mhz FSB so im still not sure why it wasnt turning on