Good job on not electrocuting yourself!
Ok, so what Motherboard is it? Do you have an external Video card? Did the motherboard come with an external speaker for troubleshooting? Try this:
Take out all of the RAM, and boot. Does the PC Beep? If not, then the motherboard is bad, and it will not display regardless, or you are missing a speaker, and you cannot know if the Motherboard can detect the missing ram to be able to proceed any further with your endeavour of a new machine!
Post back, and we can help!